drm/amd/display: Use viewport height for subvp mall allocation size

[WHY?]
MALL allocation size depends on the viewport height, not the addressable
vertical lines, which will not match when scaling.

[HOW?]
Base MALL allocation size calculations off viewport height.
Reviewed-by: Alvin Lee <Alvin.Lee2@amd.com>
Reviewed-by: Martin Leung <Martin.Leung@amd.com>
Acked-by: Brian Chang <Brian.Chang@amd.com>
Signed-off-by: Dillon Varone <Dillon.Varone@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_resource_helpers.c

@@ -111,7 +111,7 @@ uint32_t dcn32_helper_calculate_num_ways_for_subvp(struct dc *dc, struct dc_stat
 			mall_alloc_width_blk_aligned = full_vp_width_blk_aligned;
 
 			/* mall_alloc_height_blk_aligned_l/c = CEILING(sub_vp_height_l/c - 1, blk_height_l/c) + blk_height_l/c */
-			mall_alloc_height_blk_aligned = (pipe->stream->timing.v_addressable - 1 + mblk_height - 1) /
+			mall_alloc_height_blk_aligned = (pipe->plane_res.scl_data.viewport.height - 1 + mblk_height - 1) /
 					mblk_height * mblk_height + mblk_height;
 
 			/* full_mblk_width_ub_l/c = mall_alloc_width_blk_aligned_l/c;