Add support for the Amlogic Meson GXL SoC, this is a partially complete
definition only based on the Amlogic Vendor tree.

This definition differs a lot from the GXBB and needs a separate entry.
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NNeil Armstrong <narmstrong@baylibre.com>
Acked-by: NKevin Hilman <khilman@baylibre.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>