sunxi: Add defconfig and dts file for the Orange Pi PC Plus SBC

There is a new Orange Pi PC *Plus* version available now,
this is an extended version of the regular Orange Pi PC
with sdio wifi and an eMMC.

The upstream kernel devs have decided that they want a separate
dts for the PC Plus rather then sharing a single dts between the
regular PC and the PC Plus. So add a new orangepi_pc_plus_defconfig
to match.

The added dts file matches the one submitted to the upstream kernel.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index ca8712a..1c3b705 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -246,6 +246,7 @@
 	sun8i-h3-orangepi-lite.dtb \
 	sun8i-h3-orangepi-one.dtb \
 	sun8i-h3-orangepi-pc.dtb \
+	sun8i-h3-orangepi-pc-plus.dtb \
 	sun8i-h3-orangepi-plus.dtb
 dtb-$(CONFIG_MACH_SUN50I) += \
 	sun50i-a64-pine64-plus.dtb \