test: Drop SKIP_INITRD for QEMU-based tests
Not all distros support booting without an initrd. E.g. the Debian
kernel builds ext4 as a module and so relies on an initrd to
successfully start the QEMU-based images.
Cherry-picked from: c2d4da002095fe6f86f89a508a81e48fb6d3196f
patch_name: 0056-test-Drop-SKIP_INITRD-for-QEMU-based-tests.patch
present_in_specfile: true
location_in_specfile: 56
squash_commits: true