colibri_imx7: add Colibri iMX7S/iMX7D module support

This commit adds support for the Toradex Computer on Modules
Colibri iMX7S/iMX7D. The two modules/SoC's are very similar hence
can be easily supported by one board. The board code detects RAM
size at runtime which is one of the differences between the two
boards. The board also uses the UART's in DTE mode, hence making
use of the new DTE support via serial DM.

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
diff --git a/arch/arm/cpu/armv7/mx7/Kconfig b/arch/arm/cpu/armv7/mx7/Kconfig
index dd51384..5fdc8dd 100644
--- a/arch/arm/cpu/armv7/mx7/Kconfig
+++ b/arch/arm/cpu/armv7/mx7/Kconfig
@@ -27,12 +27,19 @@
 	select DM
 	select DM_THERMAL
 
+config TARGET_COLIBRI_IMX7
+	bool "Support Colibri iMX7S/iMX7D modules"
+	select DM
+	select DM_SERIAL
+	select DM_THERMAL
+
 endchoice
 
 config SYS_SOC
 	default "mx7"
 
 source "board/freescale/mx7dsabresd/Kconfig"
+source "board/toradex/colibri_imx7/Kconfig"
 source "board/warp7/Kconfig"
 
 endif