ARM: UniPhier: enable Device Tree control

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/configs/ph1_pro4_defconfig b/configs/ph1_pro4_defconfig
index e795752..acb8dc7 100644
--- a/configs/ph1_pro4_defconfig
+++ b/configs/ph1_pro4_defconfig
@@ -2,6 +2,7 @@
 +S:CONFIG_ARM=y
 +S:CONFIG_ARCH_UNIPHIER=y
 +S:CONFIG_MACH_PH1_PRO4=y
+CONFIG_DEFAULT_DEVICE_TREE="uniphier-ph1-pro4-ref"
 CONFIG_DM=y
 CONFIG_NAND_DENALI=y
 CONFIG_SYS_NAND_DENALI_64BIT=y