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/mips/mach-mscc/cpu.c b/arch/mips/mach-mscc/cpu.c
index 8273a0f5..b4ffd44 100644
--- a/arch/mips/mach-mscc/cpu.c
+++ b/arch/mips/mach-mscc/cpu.c
@@ -5,6 +5,7 @@
 
 #include <common.h>
 #include <init.h>
+#include <linux/bitops.h>
 
 #include <asm/io.h>
 #include <asm/types.h>