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/mtd/nand/raw/brcmnand/bcm6838_nand.c b/drivers/mtd/nand/raw/brcmnand/bcm6838_nand.c
index 3a13615..0788455 100644
--- a/drivers/mtd/nand/raw/brcmnand/bcm6838_nand.c
+++ b/drivers/mtd/nand/raw/brcmnand/bcm6838_nand.c
@@ -4,6 +4,7 @@
 #include <asm/io.h>
 #include <memalign.h>
 #include <nand.h>
+#include <linux/bitops.h>
 #include <linux/err.h>
 #include <linux/errno.h>
 #include <linux/io.h>