drm/amd/display: Add 90Mhz to video_optimized_pixel_rates

[Why & How]
Needed to get certain EDID to light up during TMDS compliance.
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Taimur Hassan <Syed.Hassan@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/dce/dce_clock_source.c

@@ -1157,6 +1157,7 @@ const struct pixel_rate_range_table_entry video_optimized_pixel_rates[] = {
 	{25170, 25180, 25200, 1000, 1001},	//25.2MHz   ->   25.17
 	{59340, 59350, 59400, 1000, 1001},	//59.4Mhz   ->   59.340
 	{74170, 74180, 74250, 1000, 1001},	//74.25Mhz  ->   74.1758
+	{89910, 90000, 90000, 1000, 1001},	//90Mhz     ->   89.91
 	{125870, 125880, 126000, 1000, 1001},	//126Mhz    ->  125.87
 	{148350, 148360, 148500, 1000, 1001},	//148.5Mhz  ->  148.3516
 	{167830, 167840, 168000, 1000, 1001},	//168Mhz    ->  167.83