arm: omap1: add missing includes

Add missing includes to get rid of the following sparse warnings:

arch/arm/mach-omap1/devices.c:225:13: warning: symbol 'omap1_camera_init' was not declared. Should it be static?
arch/arm/mach-omap1/flash.c:15:6: warning: symbol 'omap1_set_vpp' was not declared. Should it be static?
arch/arm/mach-omap1/serial.c:190:6: warning: symbol 'omap_serial_wake_trigger' was not declared. Should it be static?
arch/arm/mach-omap1/time.c:252:18: warning: symbol 'omap_timer' was not declared. Should it be static?

Signed-off-by: Aaro Koskinen <aaro.koskinen@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap1/time.c b/arch/arm/mach-omap1/time.c
index 1be6a21..7f75bc6 100644
--- a/arch/arm/mach-omap1/time.c
+++ b/arch/arm/mach-omap1/time.c
@@ -52,6 +52,7 @@
 #include <asm/mach/irq.h>
 #include <asm/mach/time.h>
 
+#include <plat/common.h>
 
 #define OMAP_MPU_TIMER_BASE		OMAP_MPU_TIMER1_BASE
 #define OMAP_MPU_TIMER_OFFSET		0x100