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>