amdsmn(4), amdtemp(4): add support for AMD Ryzen 7 "Phoenix" processors

Adds support for AMD Ryzen 7 "Phoenix" processors (family 0x19,
model 0x70-0x7f) to the amdsmn(4) and amdtemp(4) drivers. This
enables temperature readings of these CPUs via sysctl.

The sensors function identically to those for the "Raphael" processors
(model 0x60-0x6f); only the PCI device ID differs.

PR: kern/280942
Relnotes: yes
MFC after: 3 days