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/spi/mxc_spi.c b/drivers/spi/mxc_spi.c
index e35c6f9..f52ebf4 100644
--- a/drivers/spi/mxc_spi.c
+++ b/drivers/spi/mxc_spi.c
@@ -9,6 +9,7 @@
 #include <malloc.h>
 #include <spi.h>
 #include <dm/device_compat.h>
+#include <linux/bitops.h>
 #include <linux/delay.h>
 #include <linux/errno.h>
 #include <asm/io.h>