It will be used for reserving vmid for shader debugging
that requires a fixed vmid.

v2: fix warning (Alex)
Signed-off-by: NChunming Zhou <David1.Zhou@amd.com>
Reviewed-by: NJunwei Zhang <Jerry.Zhang@amd.com>
Reviewed-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>