drm/amd/display: Fill plane attrs only for valid pxl format

[Why]
In fill_plane_buffer_attributes() we calculate chroma/luma
assuming that the surface_pixel_format is always valid.
If it's not the case, there's a risk of divide by zero error.

[How]
Check if format valid before calculating pixel format attributes
Signed-off-by: Roman Li <Roman.Li@amd.com>
Reviewed-by: David Francis <David.Francis@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -2584,7 +2584,7 @@ fill_plane_buffer_attributes(struct amdgpu_device *adev,
 		address->type = PLN_ADDR_TYPE_GRAPHICS;
 		address->grph.addr.low_part = lower_32_bits(afb->address);
 		address->grph.addr.high_part = upper_32_bits(afb->address);
-	} else {
+	} else if (format < SURFACE_PIXEL_FORMAT_INVALID) {
 		uint64_t chroma_addr = afb->address + fb->offsets[1];
 
 		plane_size->video.luma_size.x = 0;