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/i2c/rcar_iic.c b/drivers/i2c/rcar_iic.c
index 6b21f6a..cad0a62 100644
--- a/drivers/i2c/rcar_iic.c
+++ b/drivers/i2c/rcar_iic.c
@@ -14,6 +14,7 @@
 #include <dm.h>
 #include <i2c.h>
 #include <asm/io.h>
+#include <linux/bitops.h>
 #include <linux/delay.h>
 
 struct rcar_iic_priv {