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/include/pch.h b/include/pch.h
index 0b44b66..6205668 100644
--- a/include/pch.h
+++ b/include/pch.h
@@ -7,6 +7,7 @@
 #ifndef __pch_h
 #define __pch_h
 
+#include <linux/bitops.h>
 #define PCH_RCBA		0xf0
 
 #define BIOS_CTRL_BIOSWE	BIT(0)