freedreno: add missing symbols to symbol-check

Fixes: 1384c081 "freedreno: add interface to get buffer address"
Signed-off-by: Eric Engestrom <eric.engestrom@imgtec.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>