Initialize/finalize common mes structure.

v2: add mutex_init for adev->mes.mutex

Cc: Le Ma <le.ma@amd.com>
Signed-off-by: Jack Xiao <Jack.Xiao@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>