tests: qemucapabilities: Drop mostly duplicated data
    
    When GIC support was introduced (QEMU 2.6 timeframe) we needed
    to make sure both GICv2 hardware and GICv3 hardware were handled
    correctly, and that was achieved by having separate capabilities
    data for each.
    
    Now that we have capabilities data for several QEMU versions we
    can stop storing data for GICv2 and GICv3 hardware separately,
    and instead have GICv2 data for QEMU <= 2.10 and GICv3 data for
    QEMU >= 2.12, without losing any coverage.
    
    Signed-off-by: Andrea Bolognani <abologna@redhat.com>