Backup default DPM table into golden dpm table.

v2: fix dpm_context and golden_dpm_context kfree two times issue.
Signed-off-by: NLikun Gao <Likun.Gao@amd.com>
Reviewed-by: NKevin Wang <kevin1.wang@amd.com>
Reviewed-by: NEvan Quan <evan.quan@amd.com>
Acked-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>