ice: Mention CEE DCBX in code comment

From the function ice_parse_org_tlv, CEE DCBX TLV is also supported.
So update the comment. Or else, it is confusing.

Signed-off-by: Zhu Yanjun <yanjun.zhu@linux.dev>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>