Removed fiji_mgcg_cgcg_init that is affected and redundant for new implementation.

v2: re-add mgcg_cgcg init
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Reviewed-by: NJammy Zhou <Jammy.Zhou@amd.com>
Signed-off-by: NEric Huang <JinHuiEric.Huang@amd.com>