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/s32v234evb.h b/include/configs/s32v234evb.h
index 5b1504d..ba0e506 100644
--- a/include/configs/s32v234evb.h
+++ b/include/configs/s32v234evb.h
@@ -144,6 +144,7 @@
 	"run distro_bootcmd"
 
 #include <config_distro_bootcmd.h>
+#include <linux/stringify.h>
 
 /* Miscellaneous configurable options */
 #define CONFIG_SYS_PROMPT		"=> "