uboot-imx

ARM: meson: Add Khadas VIM2 board support

This adds platform code for the Khadas VIM2 board based on a
Meson GXM (S912) SoC with the Meson GXM configuration.

This initial submission supports UART, MMC/SDCard and Ethernet.
USB is partially supported.

All the code is from Neil Armstrong! I just rebased the code, do
some cleanup and tested on my board.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Loic Devulder <ldevulder@suse.de>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>