common: Move ARM cache operations out of common.h

These functions are CPU-related and do not use driver model. Move them to
cpu_func.h

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/mips/mach-mtmips/ddr_calibrate.c b/arch/mips/mach-mtmips/ddr_calibrate.c
index 75763c4..3cd4408 100644
--- a/arch/mips/mach-mtmips/ddr_calibrate.c
+++ b/arch/mips/mach-mtmips/ddr_calibrate.c
@@ -17,6 +17,7 @@
  */
 
 #include <common.h>
+#include <cpu_func.h>
 #include <linux/io.h>
 #include <asm/cacheops.h>
 #include <asm/io.h>