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/arc/lib/cpu.c b/arch/arc/lib/cpu.c
index f032f3e..27b5832 100644
--- a/arch/arc/lib/cpu.c
+++ b/arch/arc/lib/cpu.c
@@ -9,6 +9,7 @@
 #include <vsprintf.h>
 #include <asm/arcregs.h>
 #include <asm/cache.h>
+#include <linux/bitops.h>
 
 DECLARE_GLOBAL_DATA_PTR;