lib/gem: Reset the global seqno at the start of each test

When we require GEM, reset the global seqno. This gives each test a
clean slate to work with, and avoids left-over state from previous tests
impacting on the next. In particular, somes tests may be setting up long
sequence of stalling batches not expecting to hit a seqno wraparound
(leftover from, for example, gem_exec_whisper), causing long GPU hangs
and incompletes in CI if they do.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>

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