arm64: dts: allwinner: a64: Enable HDMI output on A64 boards w/ HDMI

Enable all necessary device tree nodes and add connector node to device
trees for all supported A64 boards with HDMI.

Jagan, tested on BPI-M64, OPI-Win, A64-Olinuxino, NPI-A64
Vasily, tested on pine64-lts

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
[Icenowy: squash all board patches altogether and change supply name]
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Tested-by: Jagan Teki <jagan@amarulasolutions.com>
Tested-by: Vasily Khoruzhick <anarsoul@gmail.com>
Signed-off-by: Chen-Yu Tsai <wens@csie.org>