db820c: add qualcomm dragonboard 820C support

This commit adds support for 96Boards Dragonboard820C.

The board is based on APQ8086 Qualcomm Soc, complying with the
96Boards specification.

Features
 - 4x Kyro CPU (64 bit) up to 2.15GHz
 - USB2.0
 - USB3.0
 - ISP
 - Qualcomm Hexagon DSP
 - SD 3.0 (UHS-I)
 - UFS 2.0
 - Qualcomm Adreno 530 GPU
 - GPS
 - BT 4.2
 - Wi-Fi 2.4GHz, 5GHz (802.11ac)
 - PCIe 2.0
 - MIPI-CSI, MIPI-DSI
 - I2S

U-Boot boots chained from LK (LK implements the fastboot protocol) in
64-bit mode.

For detailed build instructions see readme.txt in the board directory.

Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
diff --git a/arch/arm/mach-snapdragon/Kconfig b/arch/arm/mach-snapdragon/Kconfig
index dc7ba21..d55dc1a 100644
--- a/arch/arm/mach-snapdragon/Kconfig
+++ b/arch/arm/mach-snapdragon/Kconfig
@@ -19,8 +19,18 @@
 	  - HDMI
 	  - 20-pin low speed and 40-pin high speed expanders, 4 LED, 3 buttons
 
+config TARGET_DRAGONBOARD820C
+	bool "96Boards Dragonboard 820C"
+	help
+	  Support for 96Boards Dragonboard 820C. This board complies with
+	  96Board Open Platform Specifications. Features:
+	  - Qualcomm Snapdragon 820C SoC - APQ8096 (4xKyro CPU)
+	  - 3GiB RAM
+	  - 32GiB UFS drive
+
 endchoice
 
 source "board/qualcomm/dragonboard410c/Kconfig"
+source "board/qualcomm/dragonboard820c/Kconfig"
 
 endif