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/arch/arm/cpu/armv7m/systick-timer.c b/arch/arm/cpu/armv7m/systick-timer.c
index dbe1b61..d2672fd 100644
--- a/arch/arm/cpu/armv7m/systick-timer.c
+++ b/arch/arm/cpu/armv7m/systick-timer.c
@@ -25,6 +25,7 @@
 #include <init.h>
 #include <time.h>
 #include <asm/io.h>
+#include <linux/bitops.h>
 
 DECLARE_GLOBAL_DATA_PTR;