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/designware_spi.c b/drivers/spi/designware_spi.c
index 09044bd..c9b14f9 100644
--- a/drivers/spi/designware_spi.c
+++ b/drivers/spi/designware_spi.c
@@ -20,6 +20,7 @@
 #include <fdtdec.h>
 #include <reset.h>
 #include <dm/device_compat.h>
+#include <linux/bitops.h>
 #include <linux/compat.h>
 #include <linux/iopoll.h>
 #include <asm/io.h>