boards: amlogic: add Beelink GT1 Ultimate defconfig

Add configuration for the Beelink GT1 Ultimate board.

Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Signed-off-by: Karl Chan <exxxxkc@getgoogleoff.me>
Link: https://lore.kernel.org/r/e3c87efd-4ac1-24a7-503d-71669aae5177@yahoo.com


Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>