drm/i915/psr: Force manual PSR exit in older gens

To do frontbuffer tracking we are depending on Display WA #0884 to
exit PSR when there is a frontbuffer modification but according to
user reports a write to CURSURFLIVE do not cause PSR to exit in older
gens so lets force a PSR exit.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=110799
Cc: Dhinakaran Pandiyan <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Signed-off-by: José Roberto de Souza <[email protected]>
Reviewed-by: Rodrigo Vivi <[email protected]>
Tested-by: Thomas Rohwer <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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