board: Add uCRobotics Bubblegum-96 board support

This commit adds uCRobotics Bubblegum-96 board support. This board is
one of the 96Boards Consumer Edition platform based on Actions Semi
S900 SoC.

Features:
- Actions Semi S900 SoC (4xCortex A53, Power VR G6230 GPU)
- 2GiB RAM
- 8GiB eMMC, uSD slot
- WiFi, Bluetooth and GPS module
- 2x Host, 1x Device USB port
- HDMI
- 20-pin low speed and 40-pin high speed expanders, 6 LED, 3 buttons

U-Boot will be loaded by ATF at EL2 execution level. Relevant driver
support will be added in further commits.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
diff --git a/arch/arm/mach-owl/Kconfig b/arch/arm/mach-owl/Kconfig
index f695c16..199e772 100644
--- a/arch/arm/mach-owl/Kconfig
+++ b/arch/arm/mach-owl/Kconfig
@@ -3,4 +3,25 @@
 config SYS_SOC
 	default "owl"
 
+choice
+        prompt "Actions Semi OWL SoCs board select"
+        optional
+
+config TARGET_BUBBLEGUM_96
+	bool "96Boards Bubblegum-96"
+	help
+	  Support for 96Boards Bubblegum-96. This board complies with
+	  96Board Consumer Edition Specification. Features:
+	  - Actions Semi S900 SoC (4xCortex A53, Power VR G6230 GPU)
+	  - 2GiB RAM
+	  - 8GiB eMMC, uSD slot
+	  - WiFi, Bluetooth and GPS module
+	  - 2x Host, 1x Device USB port
+	  - HDMI
+	  - 20-pin low speed and 40-pin high speed expanders, 6 LED, 3 buttons
+
+endchoice
+
+source "board/ucRobotics/bubblegum_96/Kconfig"
+
 endif