PSR2 workaround required when mode has delayed vblank.

BSpec: 52890
BSpec: 49421
Cc: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220210185223.95399-2-jose.souza@intel.com