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/socfpga_soc64_common.h b/include/configs/socfpga_soc64_common.h
index 61f7b25..7237ec9 100644
--- a/include/configs/socfpga_soc64_common.h
+++ b/include/configs/socfpga_soc64_common.h
@@ -9,6 +9,7 @@
 
 #include <asm/arch/base_addr_s10.h>
 #include <asm/arch/handoff_s10.h>
+#include <linux/stringify.h>
 
 /*
  * U-Boot general configurations