common gmc_ecc_late_init can be shared among all generations of gmc

v2: rename gmc_ecc_late_init to gmc_ras_late_init
Signed-off-by: NTao Zhou <tao.zhou1@amd.com>
Reviewed-by: NGuchun Chen <guchun.chen@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>