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/cpu/armv8/s32v234/generic.c b/arch/arm/cpu/armv8/s32v234/generic.c
index 50ca419..ec4641d 100644
--- a/arch/arm/cpu/armv8/s32v234/generic.c
+++ b/arch/arm/cpu/armv8/s32v234/generic.c
@@ -5,6 +5,7 @@
 
 #include <common.h>
 #include <clock_legacy.h>
+#include <cpu_func.h>
 #include <asm/io.h>
 #include <asm/arch/imx-regs.h>
 #include <asm/arch/clock.h>