ARM: u300: merge u300.c into core.c and rid headers

This gets rid of the separate u300.c file in mach-u300 since
it can just as well live right in core.c, then we also get
rid of the broadcasted <mach/platform.h> file that is not
helping anyone. Put the interface to the system timer into
a separate header.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/mach-u300/timer.c

@@ -26,6 +26,8 @@
 #include <asm/mach/time.h>
 #include <asm/mach/irq.h>
 
+#include "timer.h"
+
 /*
  * APP side special timer registers
  * This timer contains four timers which can fire an interrupt each.