drm/amd/display: Unhardcode cursor size reported back to UMD.

This will return back MAX cursor size for given ASIC.
Signed-off-by: Andrey Grodzovsky <Andrey.Grodzovsky@amd.com>
Reviewed-by: Jordan Lazare <Jordan.Lazare@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -311,8 +311,8 @@ int amdgpu_dm_init(struct amdgpu_device *adev)
 	/* TODO: Add_display_info? */
 
 	/* TODO use dynamic cursor width */
-	adev->ddev->mode_config.cursor_width = 128;
-	adev->ddev->mode_config.cursor_height = 128;
+	adev->ddev->mode_config.cursor_width = adev->dm.dc->caps.max_cursor_size;
+	adev->ddev->mode_config.cursor_height = adev->dm.dc->caps.max_cursor_size;
 
 	if (drm_vblank_init(adev->ddev, adev->dm.display_indexes_num)) {
 		DRM_ERROR(