drm/amd/display: Don't enable AFMT for DP audio stream

[WHY]
AFMT is unused for DP audio, so powering it on for DP is unnecessary.

[HOW]
APG block should be powered down instead, however HW defaults to shutdown
state when not enabled so no further work is required.
Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Acked-by: Anson Jacob <Anson.Jacob@amd.com>
Signed-off-by: Michael Strauss <michael.strauss@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_stream_encoder.c

@@ -1402,11 +1402,6 @@ static void enc1_se_disable_dp_audio(
 	struct dcn10_stream_encoder *enc1 = DCN10STRENC_FROM_STRENC(enc);
 	uint32_t value = 0;
 
-#if defined(CONFIG_DRM_AMD_DC_DCN)
-	if (enc->afmt && enc->afmt->funcs->afmt_powerdown)
-		enc->afmt->funcs->afmt_powerdown(enc->afmt);
-#endif
-
 	/* Disable Audio packets */
 	REG_UPDATE_5(DP_SEC_CNTL,
 			DP_SEC_ASP_ENABLE, 0,

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_dio_stream_encoder.c

@@ -710,8 +710,6 @@ static void enc3_se_setup_dp_audio(
 static void enc3_se_dp_audio_enable(
 	struct stream_encoder *enc)
 {
-	if (enc->afmt->funcs->afmt_poweron)
-		enc->afmt->funcs->afmt_poweron(enc->afmt);
 	enc1_se_enable_audio_clock(enc, true);
 	enc3_se_setup_dp_audio(enc);
 	enc1_se_enable_dp_audio(enc);