ARM: stih41x: Add B2020 board support

B2020 ADI board is reference board for STIH415/416 SOCs, it has 2 x
UART, 4x USB, 1 x Ethernet, 1 x SATA, 1 x PCIe, and 2GB RAM  with
standard set-top box IPs.

This patch adds initial support to B2020 with STiH415/416 with SBC_UART1
as console and a heard beat LED.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com>
CC: Stephen Gallimore <stephen.gallimore@st.com>
CC: Stuart Menefy <stuart.menefy@st.com>
CC: Arnd Bergmann <arnd@arndb.de>

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index 53ee542..31f3488 100644
--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -178,7 +178,9 @@
 	spear320-hmi.dtb
 dtb-$(CONFIG_ARCH_SPEAR6XX)+= spear600-evb.dtb
 dtb-$(CONFIG_ARCH_STI)+= stih415-b2000.dtb \
-	stih416-b2000.dtb
+	stih416-b2000.dtb \
+	stih415-b2020.dtb \
+	stih416-b2020.dtb
 dtb-$(CONFIG_ARCH_SUNXI) += \
 	sun4i-a10-cubieboard.dtb \
 	sun4i-a10-mini-xplus.dtb \