mmVGT_INDEX_TYPE has no default value, need to make sure
it's initialized when gfx is initialized.
Signed-off-by: NKen Wang <Ken.Wang@amd.com>
Reviewed-by: NHawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>