drm/i915/oa: Check that OA is disabled before unpinning

Before we unpin the buffer used for OA reports and return it to the
system, we need to be sure that the HW has finished writing into it.
For lack of a better idea, poll OACONTROL to check it is switched off.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=106379
Signed-off-by: Chris Wilson <[email protected]>
Cc: Lionel Landwerlin <[email protected]>
Cc: Matthew Auld <[email protected]>
Reviewed-by: Lionel Landwerlin <[email protected]>
Tested-by: Lionel Landwerlin <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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