arm: add initial support for Amlogic Meson and ODROID-C2

This adds platform code for the Amlogic Meson GXBaby (S905) SoC and a
board definition for ODROID-C2. This initial submission only supports
UART and Ethernet (through the existing Designware driver). DTS files
are the ones submitted to Linux arm-soc for 4.7 [1].

[1] https://patchwork.ozlabs.org/patch/603583/

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 5fd20b9..7e45642 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -456,6 +456,13 @@
 	select SUPPORT_SPL
 	select CMD_POWEROFF
 
+config ARCH_MESON
+	bool "Amlogic Meson"
+	help
+	  Support for the Meson SoC family developed by Amlogic Inc.,
+	  targeted at media players and tablet computers. We currently
+	  support the S905 (GXBaby) 64-bit SoC.
+
 config ARCH_MX7
 	bool "Freescale MX7"
 	select CPU_V7
@@ -792,6 +799,8 @@
 
 source "arch/arm/cpu/armv7/rmobile/Kconfig"
 
+source "arch/arm/mach-meson/Kconfig"
+
 source "arch/arm/mach-rockchip/Kconfig"
 
 source "arch/arm/mach-s5pc1xx/Kconfig"