vmm: Expose some more AVX512 CPUID bits to guests

[markj]

Summary

This is required to announce support for some accelerated AES
operations. AVX512BW indicates support for the AVX512-FP16 extension
and AVX512VL indicates support for the use of AVX512 instructions with
vector lengths smaller than 512 bits.

VAES and VPCLMULQDQ extensions indicate that VEX-prefixed AES-NI and
pclmulqdq instructions are supported.

All of these bits are needed for OpenSSL to use VAES to accelerate
AES-GCM operations.

Sponsored by: Stormshield
Sponsored by: Klara, Inc.

[kib]

sys/amd64/vmm/x86.c

447

() rhs around are not needed