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/flash.c b/arch/arm/mach-omap1/flash.c
index 0b07a78..acd1616 100644
--- a/arch/arm/mach-omap1/flash.c
+++ b/arch/arm/mach-omap1/flash.c
@@ -11,6 +11,7 @@
 
 #include <plat/io.h>
 #include <plat/tc.h>
+#include <plat/flash.h>
 
 void omap1_set_vpp(struct map_info *map, int enable)
 {