serial: set suppress_bind_attrs flag only if builtin

When the test 'CONFIG_DEBUG_TEST_DRIVER_REMOVE=y' is enabled,
arch_initcall(pl011_init) came before subsys_initcall(default_bdi_init).
devtmpfs gets killed because we try to remove a file and decrement the
wb reference count before the noop_backing_device_info gets initialized.

[ 0.332075] Serial: AMBA PL011 UART driver
[ 0.485276] 9000000.pl011: ttyAMA0 at MMIO 0x9000000 (irq = 39, base_baud = 0) is a PL011 rev1
[ 0.502382] console [ttyAMA0] enabled
[ 0.515710] Unable to handle kernel paging request at virtual address 0000800074c12000
[ 0.516053] Mem abort info:
[ 0.516222] ESR = 0x96000004
[ 0.516417] Exception class = DABT (current EL), IL = 32 bits
[ 0.516641] SET = 0, FnV = 0
[ 0.516826] EA = 0, S1PTW = 0
[ 0.516984] Data abort info:
[ 0.517149] ISV = 0, ISS = 0x00000004
[ 0.517339] CM = 0, WnR = 0
[ 0.517553] [0000800074c12000] user address but active_mm is swapper
[ 0.517928] Internal error: Oops: 96000004 [#1] PREEMPT SMP
[ 0.518305] Modules linked in:
[ 0.518839] CPU: 0 PID: 13 Comm: kdevtmpfs Not tainted 4.19.0-rc5-next-20180928-00002-g2ba39ab0cd01-dirty #82
[ 0.519307] Hardware name: linux,dummy-virt (DT)
[ 0.519681] pstate: 80000005 (Nzcv daif -PAN -UAO)
[ 0.519959] pc : __destroy_inode+0x94/0x2a8
[ 0.520212] lr : __destroy_inode+0x78/0x2a8
[ 0.520401] sp : ffff0000098c3b20
[ 0.520590] x29: ffff0000098c3b20 x28: 00000000087a3714
[ 0.520904] x27: 0000000000002000 x26: 0000000000002000
[ 0.521179] x25: ffff000009583000 x24: 0000000000000000
[ 0.521467] x23: ffff80007bb52000 x22: ffff80007bbaa7c0
[ 0.521737] x21: ffff0000093f9338 x20: 0000000000000000
[ 0.522033] x19: ffff80007bbb05d8 x18: 0000000000000400
[ 0.522376] x17: 0000000000000000 x16: 0000000000000000
[ 0.522727] x15: 0000000000000400 x14: 0000000000000400
[ 0.523068] x13: 0000000000000001 x12: 0000000000000001
[ 0.523421] x11: 0000000000000000 x10: 0000000000000970
[ 0.523749] x9 : ffff0000098c3a60 x8 : ffff80007bbab190
[ 0.524017] x7 : ffff80007bbaa880 x6 : 0000000000000c88
[ 0.524305] x5 : ffff0000093d96c8 x4 : 61c8864680b583eb
[ 0.524567] x3 : ffff0000093d6180 x2 : ffffffffffffffff
[ 0.524872] x1 : 0000800074c12000 x0 : 0000800074c12000
[ 0.525207] Process kdevtmpfs (pid: 13, stack limit = 0x(____ptrval____))
[ 0.525529] Call trace:
[ 0.525806] __destroy_inode+0x94/0x2a8
[ 0.526108] destroy_inode+0x34/0x88
[ 0.526370] evict+0x144/0x1c8
[ 0.526636] iput+0x184/0x230
[ 0.526871] dentry_unlink_inode+0x118/0x130
[ 0.527152] d_delete+0xd8/0xe0
[ 0.527420] vfs_unlink+0x240/0x270
[ 0.527665] handle_remove+0x1d8/0x330
[ 0.527875] devtmpfsd+0x138/0x1c8
[ 0.528085] kthread+0x14c/0x158
[ 0.528291] ret_from_fork+0x10/0x18
[ 0.528720] Code: 92800002 aa1403e0 d538d081 8b010000 (c85f7c04)
[ 0.529367] ---[ end trace 5a3dee47727f877c ]---

Rework to set suppress_bind_attrs flag to avoid removing the device when
CONFIG_DEBUG_TEST_DRIVER_REMOVE=y. This applies for pic32_uart and
xilinx_uartps as well.

Co-developed-by: Arnd Bergmann <[e-mail]>
Signed-off-by: Arnd Bergmann <[e-mail]>
Signed-off-by: Anders Roxell <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/tty/serial/amba-pl011.c

···
 		.name	= "sbsa-uart",
 		.of_match_table = of_match_ptr(sbsa_uart_of_match),
 		.acpi_match_table = ACPI_PTR(sbsa_uart_acpi_match),
+		.suppress_bind_attrs = IS_BUILTIN(CONFIG_SERIAL_AMBA_PL011),
 	},
 };
 
···
 	.drv = {
 		.name	= "uart-pl011",
 		.pm	= &pl011_dev_pm_ops,
+		.suppress_bind_attrs = IS_BUILTIN(CONFIG_SERIAL_AMBA_PL011),
 	},
 	.id_table	= pl011_ids,
 	.probe		= pl011_probe,

drivers/tty/serial/pic32_uart.c

···
 	.driver		= {
 		.name	= PIC32_DEV_NAME,
 		.of_match_table	= of_match_ptr(pic32_serial_dt_ids),
+		.suppress_bind_attrs = IS_BUILTIN(CONFIG_SERIAL_PIC32),
 	},
 };
 

drivers/tty/serial/xilinx_uartps.c

···
 		.name = CDNS_UART_NAME,
 		.of_match_table = cdns_uart_of_match,
 		.pm = &cdns_uart_dev_pm_ops,
+		.suppress_bind_attrs = IS_BUILTIN(CONFIG_SERIAL_XILINX_PS_UART),
 		},
 };