efidev: Allow for optionally including efidev and efirtc into the kernel

Require both "efirt" and "efidev" in order to build in efidev
Require both "efirt" and "efirtc" in order to build in efirtc

Update FIRECRACKER, GENERIC, and NOTES for amd64
Update NOTES and std.arm for arm64

Reviewed by: imp
Obtained from: Juniper Networks, Inc.
Differential Revision: https://reviews.freebsd.org/D44745