common: Drop linux/bitops.h from common header

Move this uncommon header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/mips/mach-jz47xx/include/mach/jz4780_dram.h b/arch/mips/mach-jz47xx/include/mach/jz4780_dram.h
index 92d431b..61cc148 100644
--- a/arch/mips/mach-jz47xx/include/mach/jz4780_dram.h
+++ b/arch/mips/mach-jz47xx/include/mach/jz4780_dram.h
@@ -12,6 +12,7 @@
 /*
  * DDR
  */
+#include <linux/bitops.h>
 #define DDRC_ST				0x0
 #define DDRC_CFG			0x4
 #define DDRC_CTRL			0x8