drm/i915/psr: Initialize PSR mutex even when sink is not reliable

Even when driver is reloaded and hits this scenario the PSR mutex
should be initialized, otherwise reading PSR debugfs status will
execute mutex_lock() over a mutex that was not initialized.

Cc: Dhinakaran Pandiyan <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Reviewed-by: Rodrigo Vivi <[email protected]>
Signed-off-by: José Roberto de Souza <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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