pan/bi: Use CLPER_V6 on Mali G31

Apparently, CLPER_V7 is missing from Mali G31, but CLPER_V6 works. Fixes
INSTR_INVALID_ENC faults and failures in
dEQP-GLES3.functional.shaders.derivate.* on Dvalin.

Technically not an errata but an implementation difference. I suspect
Mali G51 will need this as well, should we ever allowlist it.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Cc: mesa-stable
70 jobs for dumb
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