arm: sunxi: Add Sunchip CX-A99 initial support

The Sunchip CX-A99 is a board used in some media players. It features:

An Allwinner A80 ARM SoC (4 * Cortex-A7 + 4 * Cortex-A15 cores)
2 GiB or 4 GiB DDR3 DRAM
AXP808 PMIC
16 GB or 32 GB eMMC
SDIO Wifi/Bluetooth/FM module
SD card slot
1 USB 3.0 connector
2 USB 2.0 connectors
SATA connector
UART connector (internally) for serial console
Ethernet connector (10/100/1000 Mbit/s)
HDMI connector
Composite video and analog audio connector
S/PDIF connector
IR remote control receiver

This patch adds a defconfig for the board. The DRAM settings are as found
in the vendor sys_config.fex file.

It has a preliminary device tree for use until a device tree is accepted
upstream, after which it can be replaced by the upstream version.

Signed-off-by: Rask Ingemann Lambertsen <rask@formelder.dk>
[squash commits, and edited new meanful commit message]
Signed-off-by: Jagan Teki <jagan@openedev.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 17a7e8e..a2c0717 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -311,7 +311,8 @@
 	sun50i-a64-pine64.dtb
 dtb-$(CONFIG_MACH_SUN9I) += \
 	sun9i-a80-optimus.dtb \
-	sun9i-a80-cubieboard4.dtb
+	sun9i-a80-cubieboard4.dtb \
+	sun9i-a80-cx-a99.dtb
 
 dtb-$(CONFIG_VF610) += vf500-colibri.dtb \
 	vf610-colibri.dtb \