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/ostm_timer.c b/drivers/timer/ostm_timer.c
index 48a5055..bea9715 100644
--- a/drivers/timer/ostm_timer.c
+++ b/drivers/timer/ostm_timer.c
@@ -11,6 +11,7 @@
 #include <dm.h>
 #include <clk.h>
 #include <timer.h>
+#include <linux/bitops.h>
 
 #define OSTM_CMP	0x00
 #define OSTM_CNT	0x04