drm/amdgpu: set mes fw address for mes v12

Split the function of mes fimrware address setting
from mes firmware load for mes v12, as it's also
needed for rlc autoload.

Signed-off-by: Likun Gao <Likun.Gao@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>