[PATCH v3] net/iavf: support reading PHC time

[Rajesh Kumar]

The new iavf_timesync_read_time() callback converts every error returned by
iavf_phc_get_time() to -EIO. The underlying AdminQ path can return more
specific errors, including -ENOTSUP and -EINVAL, so this prevents callers
from distinguishing an unsupported operation from an actual I/O failure.

Could the original error be propagated instead?

    ret = iavf_phc_get_time(adapter, &time);
    if (ret != 0)
        return ret;