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: NJerome Brunet <jbrunet@baylibre.com>
Signed-off-by: NKevin Hilman <khilman@baylibre.com>