drm/i915/psr: Reject async flips when selective fetch is enabled

The selective fetch code doesn't handle asycn flips correctly.
There is a nonsense check for async flips in
intel_psr2_sel_fetch_config_valid() but that only gets called
for modesets/fastsets and thus does nothing for async flips.

Currently intel_async_flip_check_hw() is very unhappy as the
selective fetch code pulls in planes that are not even async
flips capable.

Reject async flips when selective fetch is enabled, until
someone fixes this properly (ie. disable selective fetch while
async flips are being issued).

Cc: [email protected]
Signed-off-by: Ville Syrjälä <[email protected]>
Link: https://patch.msgid.link/[email protected]
Reviewed-by: Jouni Högander <[email protected]>
(cherry picked from commit a5f0cc8e0cd4007370af6985cb152001310cf20c)
Signed-off-by: Rodrigo Vivi <[email protected]>

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