drm/i915/perf: Assert locking for i915_init_oa_perf_state()

We use the context->pin_mutex to serialise updates to the OA config and
the registers values written into each new context. Document this
relationship and assert we do hold the context->pin_mutex as used by
gen8_configure_all_contexts() to serialise updates to the OA config
itself.

v2: Add a white-lie for when we call intel_gt_resume() from init.
v3: Lie while we have the context pinned inside atomic reset.

Signed-off-by: Chris Wilson <[email protected]>
Cc: Lionel Landwerlin <[email protected]>
Reviewed-by: Lionel Landwerlin <[email protected]> #v1
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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