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/timer/nomadik-mtu-timer.c b/drivers/timer/nomadik-mtu-timer.c
index 8648f1f..7ff9213 100644
--- a/drivers/timer/nomadik-mtu-timer.c
+++ b/drivers/timer/nomadik-mtu-timer.c
@@ -16,6 +16,7 @@
 #include <dm.h>
 #include <timer.h>
 #include <asm/io.h>
+#include <linux/bitops.h>
 
 #define MTU_NUM_TIMERS		4