Enable pvscsi and vmx in arm64 GENERIC

FreeBSD pvscsi and vmx work with VMware ESXi Arm "Fling"; provide these
in GENERIC for a convenient out-of-the-box experience.

PR: 253202
Reported by: Vincent Milum Jr
Approved by: re (gjb)
Sponsored by: The FreeBSD Foundation

(cherry picked from commit 375d797b81916eb3d16927c9dac8c42975784252)
(cherry picked from commit 87eac7608343d86f2d33d15139ca467565bd7623)