Hide WAITPKG cpu feature from vmm(4) guests.

Hide WAITPKG cpu feature from vmm(4) guests.

Alder Lake and similar-era Intel platforms introduced new userland
wait instructions. Since vmm was passing this cpuid bit into guests,
some would attempt TPAUSE instructions and trigger invalid instruction
exceptions because VMX requires additional configuration to support
emulation.

This also adds WAITPKG to i386 and amd64 cpu feature identification.

Input from anton@, cheloha@, and guenther@. Tested by jmatthew@.

OK deraadt.