[ARM] Remove linux/sched.h from asm/cacheflush.h and asm/uaccess.h

... and fix those drivers that were incorrectly relying upon
that include.

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

drivers/watchdog/sa1100_wdt.c

@@ -27,6 +27,7 @@
 #include <linux/init.h>
 #include <linux/bitops.h>
 #include <linux/uaccess.h>
+#include <linux/timex.h>
 
 #ifdef CONFIG_ARCH_PXA
 #include <mach/pxa-regs.h>