libpmc: add more alderlake models

According to [1], the CPU models 6-{b7,ba,bf} are also alderlake-family
models. This patch adds them to the mapfile.csv.

[1] https://github.com/torvalds/linux/blob/master/tools/perf/pmu-events/arch/x86/mapfile.csv#L2

Reviewed by: mhorne
MFC after: 3 days
Sponsored by: Stormshield
Differential Revision: https://reviews.freebsd.org/D49126