Revert "qa/tasks/rbd: handle auth key_type overrides for legacy aes ciphers"

This reverts commit 5c670c57d1b5604e6fe91e31830048718e2a1486.

This breaks rbd:encryption:

    rbd/encryption/{cache/writeback clusters/{fixed-3} conf/{disable-pool-app} data-pool/ec features/defaults msgr-failures/few objectstore/bluestore-low-osd-mem-target supported-random-distro/{centos_9.stream} workloads/qemu_xfstests_luks1_luks1}

which causes hung/dead jobs.

Change-Id: 6f221f38-8da4-463d-b919-e84f34509ab0
Signed-off-by: Patrick Donnelly <pdonnell@ibm.com>