pmc: add alderlake model

The commit 601925180df4 added the models 6-B7, 6-BA, 6-BF to libpmc, but
they must also be added to the hwpmc module to allow pmc to work on
those CPUs.

Reviewed by: mhorne
MFC after: 1 week
Fixes: 601925180df4 ("libpmc: add more alderlake models")
Sponsored by: Stormshield
Differential Revision: https://reviews.freebsd.org/D49255

(cherry picked from commit 057dae35ffc6b17dacc84fa21921e93a17ce12b0)