common: Move older CPU functions to their own header

These should be moved to driver model, but in the meantime, move them
out of the common header to help reduce its size.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/cpu/armv8/fsl-layerscape/mp.c b/arch/arm/cpu/armv8/fsl-layerscape/mp.c
index 7627fd1..ca07c68 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/mp.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/mp.c
@@ -4,6 +4,7 @@
  */
 
 #include <common.h>
+#include <cpu_func.h>
 #include <asm/io.h>
 #include <asm/system.h>
 #include <asm/arch/mp.h>
diff --git a/arch/arm/mach-imx/mx6/mp.c b/arch/arm/mach-imx/mx6/mp.c
index eda168d..2fdf070 100644
--- a/arch/arm/mach-imx/mx6/mp.c
+++ b/arch/arm/mach-imx/mx6/mp.c
@@ -7,6 +7,7 @@
  */
 
 #include <common.h>
+#include <cpu_func.h>
 #include <asm/io.h>
 #include <linux/errno.h>
 #include <asm/arch/sys_proto.h>
diff --git a/arch/arm/mach-zynqmp/mp.c b/arch/arm/mach-zynqmp/mp.c
index 2a71870..fbb5511 100644
--- a/arch/arm/mach-zynqmp/mp.c
+++ b/arch/arm/mach-zynqmp/mp.c
@@ -5,6 +5,7 @@
  */
 
 #include <common.h>
+#include <cpu_func.h>
 #include <asm/arch/hardware.h>
 #include <asm/arch/sys_proto.h>
 #include <asm/io.h>