drm/panfrost: Remove unnecessary hwaccess_lock spin_lock

With the introduction of the as_lock to serialize address space registers,
the hwaccess_lock is only used within the job code and is not protecting
anything. panfrost_job_hw_submit() only accesses registers for 1 job slot
and it's already serialized by drm_sched.

Fixes: 7282f7645d06 ("drm/panfrost: Implement per FD address spaces")
Cc: Tomeu Vizoso <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Daniel Vetter <[email protected]>
Signed-off-by: Rob Herring <[email protected]>
Acked-by: Alyssa Rosenzweig <[email protected]>
Reviewed-by: Steven Price <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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