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/clk/clk_boston.c b/drivers/clk/clk_boston.c
index 0c49ee0..2318dcf 100644
--- a/drivers/clk/clk_boston.c
+++ b/drivers/clk/clk_boston.c
@@ -9,6 +9,7 @@
 #include <dt-bindings/clock/boston-clock.h>
 #include <regmap.h>
 #include <syscon.h>
+#include <linux/bitops.h>
 
 struct clk_boston {
 	struct regmap *regmap;