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/board/freescale/mpc837xemds/mpc837xemds.c b/board/freescale/mpc837xemds/mpc837xemds.c
index d53c861..182391c 100644
--- a/board/freescale/mpc837xemds/mpc837xemds.c
+++ b/board/freescale/mpc837xemds/mpc837xemds.c
@@ -9,6 +9,7 @@
 #include <i2c.h>
 #include <init.h>
 #include <net.h>
+#include <asm/bitops.h>
 #include <asm/io.h>
 #include <asm/fsl_mpc83xx_serdes.h>
 #include <spd_sdram.h>