[PATCH] board: rockchip: add Pine64 QuartzPro64 RK3588 board

[Tom Fitzhenry]

Tom Fitzhenry <tom at tom-fitzhenry.me.uk> writes:

> QuartzPro64 is a Rockchip RK3588 based SBC by Pine64.
>
> UART and booting over SD card are tested to work.

I've found a few issues with this patch, incl. confusion over the
relationship between rk3588-quartzpro64.dts and
rk3588-quartzpro64-u-boot.dtsi .

I will rework this patch as a v2, and include eMMC support too.