drm/i915/display: Do not re-enable PSR after it was marked as not reliable

If a error happens and sink_not_reliable is set, PSR should be disabled
for good but that is not happening.
It would be disabled by the function handling the PSR error but then
on the next fastset it would be enabled again in
_intel_psr_post_plane_update().
It would only be disabled for good in the next modeset where has_psr
will be set false.

v2:
- release psr lock before continue

Fixes: 9ce5884e5139 ("drm/i915/display: Only keep PSR enabled if there is active planes")
Reported-by: Khaled Almahallawy <[email protected]>
Reported-by: Charlton Lin <[email protected]>
Cc: Jouni Högander <[email protected]>
Signed-off-by: José Roberto de Souza <[email protected]>
Reviewed-by: Jouni Högander <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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