arm64: dts: meson-gxl: add support for phicomm n1

This patch adds support for the Phicomm N1. This device based on P230 reference design.
And this box doesn't have cvbs, so disable related section in device tree.

Signed-off-by: He Yangxuan <yangxuan8282@gmail.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>