ifconfig: Display the IFCAP_HWSTATS capability without netlink

This follows the commit 4cdc1f5421c5, which introduces the IFCAP_HWSTATS
capability.

Fixes: 4cdc1f5421c5 There are some high performance NICs that count statistics in hardware
MFC after: 3 days

(cherry picked from commit 595acb29a35f36a4fc08b89d3a476f16c1d108b4)
(cherry picked from commit 6bcce275a5a9e10f8e5b990f8cfa2166aa49875a)