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/drivers/ddr/fsl/ctrl_regs.c b/drivers/ddr/fsl/ctrl_regs.c
index ed60b22..2d3fb19 100644
--- a/drivers/ddr/fsl/ctrl_regs.c
+++ b/drivers/ddr/fsl/ctrl_regs.c
@@ -16,6 +16,7 @@
 #include <fsl_ddr.h>
 #include <fsl_immap.h>
 #include <log.h>
+#include <asm/bitops.h>
 #include <asm/io.h>
 #if defined(CONFIG_FSL_LSCH2) || defined(CONFIG_FSL_LSCH3) || \
 	defined(CONFIG_ARM)