drm/amd/display: fix zstate allow interface to PMFW

[Why]
psr_feature_enabled flag is dynamically updated, and sometimes when
zstate allow status is determined the flag has not been set to true yet
even on PSR enabled config, lid off/on is such a case, which will result
in zstate disabled even though PSR is supported.

[How]
Check the supported PSR version and the PSR disable status instead.
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Eric Yang <Eric.Yang2@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c

@@ -3099,7 +3099,7 @@ static enum dcn_zstate_support_state  decide_zstate_support(struct dc *dc, struc
 
 		if (context->bw_ctx.dml.vba.StutterPeriod > 5000.0)
 			return DCN_ZSTATE_SUPPORT_ALLOW;
-		else if (link->psr_settings.psr_feature_enabled)
+		else if (link->psr_settings.psr_version == DC_PSR_VERSION_1 && !dc->debug.disable_psr)
 			return DCN_ZSTATE_SUPPORT_ALLOW_Z10_ONLY;
 		else
 			return DCN_ZSTATE_SUPPORT_DISALLOW;