panfrost: Add Valhall support to pandecode

Valhall v9 introduces a number of new data structures since Bifrost v7,
and removes a number of traditional data structures. Add decode routines
for the new Valhall data structures, and condition the old routines on
(PAN_ARCH <= 7) to remain buildable and warning-free.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <!14063>
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