move WIP u-boot modifications in libre-testing

I asked bill-auger to push his modifications so he uploaded the
packages to libre-testing and the PKGBUILD modifications to abslibre.

Since the pakcages have been uploaded to libre-testing it's better to
move them here.

While the code is not ready yet, it enables users to test the new
u-boot which fixes the Ethernet PHY. From linux-sunxi we have[1]:
    Proper fix for rev. F and newer is to apply trace length
    compensation at the PHY.

    This is done by default (also for rev. H and newer despite commit
    message mentioning only realtek not Micrel) since mainline linux
    v5.15 and since mainline u-boot v2022.04;

[1]https://linux-sunxi.org/Olimex_A20-OLinuXino-Lime2#calibrate_at_PHY

That page also has more background on the issue being fixed here
(basically making all the various Lime 2 A20 revisions (which have
different Ethernet PHY) work with the same u-boot binary / package.

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

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