Add support for building Rock 5A from the collabora tree

[Ekmansoft]

Description

With this change, it is possible to select the collabora branch and build it on a Radxa Rock 5A.

How Has This Been Tested?

In Ubuntu on an x64 CPU, I have run ./compile.sh, selected the Rock-5a wip product, and then selected the collabora branch.
I built if with desktop (which is overkill of course), but it boots nicely to Linux. I was allowed to setup my own user and the Ethernet port works nicely.

uname -a

Linux rock-5a 6.5.0-rc1-collabora-rockchip-rk3588 #1 SMP PREEMPT_DYNAMIC Fri Jul 28 15:49:06 UTC 2023 aarch64 GNU/Linux

lsusb

Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 003: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 006 Device 002: ID 1a40:0101 Terminus Technology Inc. Hub
Bus 006 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Checklist:

• [x ] My code follows the style guidelines of this project
• [ x] I have performed a self-review of my own code
• [ x] I have commented my code, particularly in hard-to-understand areas
• [ x] I have made corresponding changes to the documentation
• [ x] My changes generate no new warnings
• [ x] Any dependent changes have been merged and published in downstream modules