there are 2 hubs to flush in the gmc, to make it easier
to debug when hub flush failed, refine the logs.
Signed-off-by: Peng Ju Zhou <PengJu.Zhou@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>