move functions in tonga_smc.c to tonga_smumgr.c
and make all functions in tonga_smumgr.c static.
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NRex Zhu <Rex.Zhu@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>