drm/amd/display: Fix underflow when playing 8K video in full screen mode

[Why&How]
Flickering observed while playing 8k HEVC-10 bit video in full screen
mode with black border. We didn't support this case for subvp.
Make change to the existing check to disable subvp for this corner case.

Reviewed-by: Alvin Lee <[e-mail]>
Signed-off-by: Leo Ma <[e-mail]>
Signed-off-by: Dillon Varone <[e-mail]>
Signed-off-by: Tom Chung <[e-mail]>
Tested-by: Daniel Wheeler <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/dc/dml2/dml21/dml21_translation_helper.c

···
 	plane->immediate_flip = plane_state->flip_immediate;
 
 	plane->composition.rect_out_height_spans_vactive =
-		plane_state->dst_rect.height >= stream->timing.v_addressable &&
+		plane_state->dst_rect.height >= stream->src.height &&
 		stream->dst.height >= stream->timing.v_addressable;
 }