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/cache.c b/arch/arc/lib/cache.c
index 8a1d678..85651b2 100644
--- a/arch/arc/lib/cache.c
+++ b/arch/arc/lib/cache.c
@@ -6,6 +6,7 @@
 #include <config.h>
 #include <common.h>
 #include <cpu_func.h>
+#include <linux/bitops.h>
 #include <linux/compiler.h>
 #include <linux/kernel.h>
 #include <linux/log2.h>