ARM64: dts: meson-gxl: Add Libre Technology CC support

Add support for the CC  board from Shenzhen Libre Technology
More information about the board are available here:

https://libre.computer/blog/



Cc: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>