drm/amd/display: arbitration find the matching dig-az first.

[Description]
this change is in branch already.
without this change, after resume, az_inst might swapped.
Signed-off-by: Charlene Liu <charlene.liu@amd.com>
Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc_resource.c

@@ -1417,21 +1417,17 @@ static struct audio *find_first_free_audio(
 		const struct resource_pool *pool)
 {
 	int i;
-	if (pool->audio_count >=  pool->stream_enc_count) {
 	for (i = 0; i < pool->audio_count; i++) {
 		if ((res_ctx->is_audio_acquired[i] == false) && (res_ctx->is_stream_enc_acquired[i] == true)) {
-				/*we have enough audio endpoint, no need to do dynamic distribution*/
 			return pool->audios[i];
 		}
 	}
-	} else { /*first come first serve*/
+	/*not found the matching one, first come first serve*/
 	for (i = 0; i < pool->audio_count; i++) {
 		if (res_ctx->is_audio_acquired[i] == false) {
-
 			return pool->audios[i];
 		}
 	}
-	}
 	return 0;
 }