common: Move reset_cpu() to the CPU header

Move this function out of common.h and into a relevant header file.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-omap2/reset.c b/arch/arm/mach-omap2/reset.c
index ea27248..2bbd5fc 100644
--- a/arch/arm/mach-omap2/reset.c
+++ b/arch/arm/mach-omap2/reset.c
@@ -9,6 +9,7 @@
  * Sricharan R <r.sricharan@ti.com>
  */
 #include <config.h>
+#include <cpu_func.h>
 #include <asm/io.h>
 #include <asm/arch/cpu.h>
 #include <linux/compiler.h>