ARM: omap: fix address space warnings from sparse

Moving sram code from plat-omap got the attention of the kernel test robot.

I found a few more places with related warnings because the sram
references are a mix of kernel pointers and __iomem pointers:

mach-omap1/sram-init.c:56:17: warning: cast removes address space '__iomem' of expression
mach-omap1/board-ams-delta.c:667:9: warning: incorrect type in argument 1 (different base types)
mach-omap2/sram.c:78:17: warning: cast removes address space '__iomem' of expression
mach-omap2/omap4-common.c:142:27: warning: incorrect type in assignment (different address spaces)
mach-omap2/omap4-common.c:142:27: expected void [noderef] __iomem *static [toplevel] sram_sync
mach-omap2/omap4-common.c:142:27: got void *
mach-omap2/pm34xx.c:113:45: warning: incorrect type in argument 1 (different address spaces)
mach-omap2/pm34xx.c:113:45: expected void [noderef] __iomem *save_regs
mach-omap2/pm34xx.c:113:45: got void *extern [addressable] [toplevel] omap3_secure_ram_storage

There is no good solution here, as sram is a bit special in this
regard. Change the annotations to at least shut up the warnings.

Reported-by: kernel test robot <[e-mail]>
Signed-off-by: Arnd Bergmann <[e-mail]>

arch/arm/mach-omap1/board-ams-delta.c

···
 {
 	u16 latch2 = 1 << LATCH2_PIN_MODEM_NRESET | 1 << LATCH2_PIN_MODEM_CODEC;
 
-	__raw_writew(latch2, LATCH2_VIRT);
+	__raw_writew(latch2, IOMEM(LATCH2_VIRT));
 }
 
 static void __init ams_delta_init(void)

arch/arm/mach-omap1/sram-init.c

···
 	new_ceil = ROUND_DOWN(new_ceil, FNCPY_ALIGN);
 	omap_sram_ceil = IOMEM(new_ceil);
 
-	return (void *)omap_sram_ceil;
+	return (void __force *)omap_sram_ceil;
 }
 
 void *omap_sram_push(void *funcp, unsigned long size)

arch/arm/mach-omap2/omap-secure.c

···
 }
 
 #if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_PM)
-u32 omap3_save_secure_ram(void __iomem *addr, int size)
+u32 omap3_save_secure_ram(void *addr, int size)
 {
 	static u32 param[5];
 	u32 ret;

arch/arm/mach-omap2/omap-secure.h

···
 extern phys_addr_t omap_secure_ram_mempool_base(void);
 extern int omap_secure_ram_reserve_memblock(void);
 extern u32 save_secure_ram_context(u32 args_pa);
-extern u32 omap3_save_secure_ram(void __iomem *save_regs, int size);
+extern u32 omap3_save_secure_ram(void *save_regs, int size);
 
 extern u32 rx51_secure_dispatcher(u32 idx, u32 process, u32 flag, u32 nargs,
 				  u32 arg1, u32 arg2, u32 arg3, u32 arg4);

arch/arm/mach-omap2/omap4-common.c

···
 		pr_warn("%s:Unable to get sram pool needed to handle errata I688\n",
 			__func__);
 	else
-		sram_sync = (void *)gen_pool_alloc(sram_pool, PAGE_SIZE);
+		sram_sync = (void __iomem *)gen_pool_alloc(sram_pool, PAGE_SIZE);
 
 	return 0;
 }

arch/arm/mach-omap2/sram.c

···
 	new_ceil = ROUND_DOWN(new_ceil, FNCPY_ALIGN);
 	omap_sram_ceil = IOMEM(new_ceil);
 
-	return (void *)omap_sram_ceil;
+	return (void __force *)omap_sram_ceil;
 }
 
 void *omap_sram_push(void *funcp, unsigned long size)