drm/amd/display: Source minimum HBlank support

[Why]
Some sink devices wish to have access to the minimum HBlank supported by
the ASIC.

[How]
Make the ASIC minimum HBlank available in Source Device information
address 0x340.
Signed-off-by: Ashley Thomas <Ashley.Thomas2@amd.com>
Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn301/dcn301_resource.c

@@ -1761,6 +1761,7 @@ static bool dcn301_resource_construct(
 	dc->caps.i2c_speed_in_khz = 100;
 	dc->caps.i2c_speed_in_khz_hdcp = 5; /*1.4 w/a enabled by default*/
 	dc->caps.max_cursor_size = 256;
+	dc->caps.min_horizontal_blanking_period = 80;
 	dc->caps.dmdata_alloc_size = 2048;
 	dc->caps.max_slave_planes = 1;
 	dc->caps.is_apu = true;

drivers/gpu/drm/amd/display/dc/dcn302/dcn302_resource.c

@@ -1309,6 +1309,7 @@ static bool dcn302_resource_construct(
 	dc->caps.i2c_speed_in_khz = 100;
 	dc->caps.i2c_speed_in_khz_hdcp = 5; /*1.4 w/a applied by derfault*/
 	dc->caps.max_cursor_size = 256;
+	dc->caps.min_horizontal_blanking_period = 80;
 	dc->caps.dmdata_alloc_size = 2048;
 
 	dc->caps.max_slave_planes = 1;