gpio: Fix lockdep warnings in gpiolib_{cdev,sysfs}_register()

A lockdep warning is reported in gpiolib-cdev driver:

WARNING: drivers/gpio/gpiolib-cdev.c:2735 at
gpiolib_cdev_register+0x114/0x140, CPU#1: swapper/0/1
Modules linked in:
CPU: 1 UID: 0 PID: 1 Comm: swapper/0 Not tainted
7.0.0-rc1-next-20260227-00065-g6af4b9cfeded #12259 PREEMPT
Hardware name: Samsung Exynos (Flattened Device Tree)
Call trace:
unwind_backtrace from show_stack+0x10/0x14
show_stack from dump_stack_lvl+0x68/0x88
dump_stack_lvl from __warn+0x94/0x210
__warn from warn_slowpath_fmt+0x1b0/0x1bc
warn_slowpath_fmt from gpiolib_cdev_register+0x114/0x140
gpiolib_cdev_register from gpiochip_setup_dev+0x4c/0xd0
gpiochip_setup_dev from gpiochip_add_data_with_key+0x960/0xad4
gpiochip_add_data_with_key from devm_gpiochip_add_data_with_key+0x20/0x5c

This is because the SRCU wasn't held in gpiolib_cdev_register() when the
caller is from gpiochip_add_data_with_key() instead of
gpiochip_setup_devs(). gpiochip_sysfs_register() shares the similar
concern.

Given that both gpiolib_cdev_register() and gpiochip_sysfs_register()
are only called from gpiolib but no external users. Remove the lockdep
checks to fix the warnings.

Reported-by: Marek Szyprowski <[e-mail]>
Closes: https://lore.kernel.org/all/[e-mail]/
Fixes: cf674f1a0c98 ("gpio: Ensure struct gpio_chip for gpiochip_setup_dev()")
Signed-off-by: Tzung-Bi Shih <[e-mail]>
Tested-by: Marek Szyprowski <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Bartosz Golaszewski <[e-mail]>

drivers/gpio/gpiolib-cdev.c

···
 	struct gpio_device *gdev = gc->gpiodev;
 	int ret;
 
-	lockdep_assert_held(&gdev->srcu);
-
 	cdev_init(&gdev->chrdev, &gpio_fileops);
 	gdev->chrdev.owner = THIS_MODULE;
 	gdev->dev.devt = MKDEV(MAJOR(devt), gdev->id);

drivers/gpio/gpiolib-sysfs.c

···
 	struct device *parent;
 	int err;
 
-	lockdep_assert_held(&gdev->srcu);
-
 	/*
 	 * Many systems add gpio chips for SOC support very early,
 	 * before driver model support is available.  In those cases we