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/mikrotik/crs305-1g-4s/crs305-1g-4s.c b/board/mikrotik/crs305-1g-4s/crs305-1g-4s.c
index 4b67a4b..8b419ef 100644
--- a/board/mikrotik/crs305-1g-4s/crs305-1g-4s.c
+++ b/board/mikrotik/crs305-1g-4s/crs305-1g-4s.c
@@ -7,6 +7,7 @@
 #include <i2c.h>
 #include <init.h>
 #include <asm/gpio.h>
+#include <linux/bitops.h>
 #include <linux/mbus.h>
 #include <linux/io.h>
 #include <asm/arch/cpu.h>