drm/amd/display: avoid set dispclk to 0

[why]
set dispclk to 0 cause stability issue.

Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Charlene Liu <Charlene.Liu@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 1c6b16ebf5eb2bc5740be9e37b3a69f1dfe1dded)
Cc: stable@vger.kernel.org

drivers/gpu/drm/amd/display/dc/resource/dcn351/dcn351_resource.c

@@ -766,6 +766,7 @@ static const struct dc_debug_options debug_defaults_drv = {
 	.disable_dmub_reallow_idle = false,
 	.static_screen_wait_frames = 2,
 	.notify_dpia_hr_bw = true,
+	.min_disp_clk_khz = 50000,
 };
 
 static const struct dc_panel_config panel_config_defaults = {