ARM: 8581/1: add missing <asm/prom.h> to arch/arm/kernel/devtree.c

Fix the following warnings by including declarations
from <asm/prom.h>:

arch/arm/kernel/devtree.c:69:13: warning: symbol 'arm_dt_init_cpu_maps' was not declared. Should it be static?
arch/arm/kernel/devtree.c:210:27: warning: symbol 'setup_machine_fdt' was not declared. Should it be static?

Signed-off-by: Ben Dooks <[e-mail]>
Acked-by: Arnd Bergmann <[e-mail]>
Signed-off-by: Russell King <[e-mail]>

arch/arm/kernel/devtree.c

···
 #include <asm/cputype.h>
 #include <asm/setup.h>
 #include <asm/page.h>
+#include <asm/prom.h>
 #include <asm/smp_plat.h>
 #include <asm/mach/arch.h>
 #include <asm/mach-types.h>