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>

drivers/sysreset/sysreset-uclass.c

@@ -7,6 +7,7 @@
 #define LOG_CATEGORY UCLASS_SYSRESET
 
 #include <common.h>
+#include <cpu_func.h>
 #include <sysreset.h>
 #include <dm.h>
 #include <errno.h>

drivers/watchdog/imx_watchdog.c

@@ -5,6 +5,7 @@
  */
 
 #include <common.h>
+#include <cpu_func.h>
 #include <dm.h>
 #include <asm/io.h>
 #include <wdt.h>

drivers/watchdog/ulp_wdog.c

@@ -4,6 +4,7 @@
  */
 
 #include <common.h>
+#include <cpu_func.h>
 #include <asm/io.h>
 #include <asm/arch/imx-regs.h>