[ARM] Fix missing compiler.h include

asm/mach/arch.h introduced a __deprecated, but didn't include compiler.h,
causing:

In file included from arch/arm/mach-at91rm9200/devices.c:13:
include/asm/mach/arch.h:23: warning: no semicolon at end of struct or union
include/asm/mach/arch.h:23: error: syntax error before 'phys_ram'
include/asm/mach/arch.h:34: error: syntax error before ':' token
include/asm/mach/arch.h:35: error: syntax error before ':' token
include/asm/mach/arch.h:36: error: syntax error before ':' token
include/asm/mach/arch.h:37: error: syntax error before ':' token
include/asm/mach/arch.h:45: error: syntax error before '}' token

Add the necessary include.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

authored by Russell King and committed by Russell King ef0498a7 caf5b04c

+2
+2
include/asm-arm/mach/arch.h
··· 10 11 #ifndef __ASSEMBLY__ 12 13 struct tag; 14 struct meminfo; 15 struct sys_timer;
··· 10 11 #ifndef __ASSEMBLY__ 12 13 + #include <linux/compiler.h> 14 + 15 struct tag; 16 struct meminfo; 17 struct sys_timer;