drm/amd/display: add missing code change init pix_per_cycle

[why]
missing change when port to these two dcn version.
Reviewed-by: Chris Park <Chris.Park@amd.com>
Reviewed-by: Leo Ma <hanghong.ma@amd.com>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Charlene Liu <Charlene.Liu@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/dcn32/dcn32_dio_stream_encoder.c

@@ -294,6 +294,7 @@ static void enc32_stream_encoder_dp_unblank(
 			|| is_dp_dig_pixel_rate_div_policy(dc, &param->timing)) {
 			/*this logic should be the same in get_pixel_clock_parameters() */
 			n_multiply = 1;
+			pix_per_cycle = 1;
 		}
 		/* M / N = Fstream / Flink
 		 * m_vid / n_vid = pixel rate / link rate