gpu/intel: Allow to select a different metric set

Allow to use any metric set exposed by the driver, only one metric set can
be selected at a time so don't allow to mix the counters from different sets.

Keep the sane default to RenderBasic when "all counters" are requested.

Signed-off-by: Corentin Noël <corentin.noel@collabora.com>
Reviewed-by: Antonio Caggiano <antonio.caggiano@collabora.com>
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