hwpmc: Enable hwpmc support for AMD Family 17H devices

Adds new counters and events for family 17H devices.
Adds libpmc support for family 17H devices.

Direct commit to 11 as this is supported by way of JSON
counter descriptions on 12 & HEAD.

Submitted by: Girish Nandibasappa
Differential Revision: https://reviews.freebsd.org/D17464