ARM: dts: uniphier: add PXs3 SoC/board support

Initial commit for the PXs3 SoC DT.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 3dbbaa7..6a7924e 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -98,6 +98,8 @@
 dtb-$(CONFIG_ARCH_UNIPHIER_PXS2) += \
 	uniphier-pxs2-gentil.dtb \
 	uniphier-pxs2-vodka.dtb
+dtb-$(CONFIG_ARCH_UNIPHIER_PXS3) += \
+	uniphier-pxs3-ref.dtb
 dtb-$(CONFIG_ARCH_UNIPHIER_SLD3) += \
 	uniphier-sld3-ref.dtb
 dtb-$(CONFIG_ARCH_UNIPHIER_SLD8) += \