common: Drop linux/stringify.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/configs/T102xQDS.h b/include/configs/T102xQDS.h
index 5f358c1..53ae961 100644
--- a/include/configs/T102xQDS.h
+++ b/include/configs/T102xQDS.h
@@ -11,6 +11,8 @@
 #ifndef __T1024QDS_H
 #define __T1024QDS_H
 
+#include <linux/stringify.h>
+
 /* High Level Configuration Options */
 #define CONFIG_SYS_BOOK3E_HV		/* Category E.HV supported */
 #define CONFIG_ENABLE_36BIT_PHYS