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/board/st/stm32mp1/board.c b/board/st/stm32mp1/board.c
index b0d1650..c218d37 100644
--- a/board/st/stm32mp1/board.c
+++ b/board/st/stm32mp1/board.c
@@ -7,6 +7,7 @@
 #include <dm.h>
 #include <asm/io.h>
 #include <asm/arch/ddr.h>
+#include <linux/bitops.h>
 #include <linux/delay.h>
 #include <power/pmic.h>
 #include <power/stpmic1.h>