drm/i915/psr: Remove inappropriate DSC slice alignment warning

Selective update area is now aligned with DSC slice height when
DSC is enabled. Remove inappropriate warning about missing DSC
alignment.

Cc: José Roberto de Souza <jose.souza@intel.com>
Cc: Mika Kahola <mika.kahola@intel.com>

Fixes: 47d4ae21 ("drm/i915/mtl: Extend PSR support")
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/7212


Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221102174544.2288205-3-jouni.hogander@intel.com