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-tegra/cmd_enterrcm.c b/arch/arm/mach-tegra/cmd_enterrcm.c
index 5247e52..b2252f3 100644
--- a/arch/arm/mach-tegra/cmd_enterrcm.c
+++ b/arch/arm/mach-tegra/cmd_enterrcm.c
@@ -25,6 +25,7 @@
  */
 
 #include <common.h>
+#include <cpu_func.h>
 #include <irq_func.h>
 #include <asm/arch/tegra.h>
 #include <asm/arch-tegra/pmc.h>