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/arm/mach-meson/sm.c b/arch/arm/mach-meson/sm.c
index dd66076..ebbb880 100644
--- a/arch/arm/mach-meson/sm.c
+++ b/arch/arm/mach-meson/sm.c
@@ -12,6 +12,7 @@
 #include <asm/arch/sm.h>
 #include <asm/cache.h>
 #include <asm/ptrace.h>
+#include <linux/bitops.h>
 #include <linux/err.h>
 #include <linux/kernel.h>
 #include <dm.h>