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/rockchip/clk_rk3308.c b/drivers/clk/rockchip/clk_rk3308.c
index 5889cf8..d3633b6 100644
--- a/drivers/clk/rockchip/clk_rk3308.c
+++ b/drivers/clk/rockchip/clk_rk3308.c
@@ -17,6 +17,7 @@
 #include <asm/arch-rockchip/hardware.h>
 #include <dm/lists.h>
 #include <dt-bindings/clock/rk3308-cru.h>
+#include <linux/bitops.h>
 
 DECLARE_GLOBAL_DATA_PTR;