[Merge] ~xypron/livecd-rootfs:pic64gx into livecd-rootfs:ubuntu/master

[Heinrich Schuchardt]

The related Launchpad bug is LP 2072956
[SRU] Build preinstalled image for PIC64GX Curiosity Kit

The device-tree for the board is due to be added in time for the 24.04.1 release to the linux-image-generic. Until then builds with SUBARCH=pic64gx will fail.
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https://code.launchpad.net/~xypron/livecd-rootfs/+git/livecd-rootfs/+merge/469845
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