drm/amd/display: Fix VBA chroma calculation for pipe splitting

[Why]
DML failures occur for 420 modes with dynamic pipe
splitting enabled because the ChromaViewport exceeds
the ChromaSurfaceWidth.

This is caused by adding the viewport_width instead
of the viewport_width_c.

This similarly occurs for rotated modes due to the
use of viewport_height instead of viewport_height_c.

[How]
Correct the calculations.
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.c

@@ -623,14 +623,14 @@ static void fetch_pipe_params(struct display_mode_lib *mode_lib)
 						mode_lib->vba.ViewportWidth[mode_lib->vba.NumberOfActivePlanes] +=
 								src_k->viewport_width;
 						mode_lib->vba.ViewportWidthChroma[mode_lib->vba.NumberOfActivePlanes] +=
-								src_k->viewport_width;
+								src_k->viewport_width_c;
 						mode_lib->vba.ScalerRecoutWidth[mode_lib->vba.NumberOfActivePlanes] +=
 								dst_k->recout_width;
 					} else {
 						mode_lib->vba.ViewportHeight[mode_lib->vba.NumberOfActivePlanes] +=
 								src_k->viewport_height;
 						mode_lib->vba.ViewportHeightChroma[mode_lib->vba.NumberOfActivePlanes] +=
-								src_k->viewport_height;
+								src_k->viewport_height_c;
 					}
 					mode_lib->vba.NumberOfDSCSlices[mode_lib->vba.NumberOfActivePlanes] +=
 							dout_k->dsc_slices;