Instead of having a separate sysutils/uefi-edk2-bhyve port, add bhyve
as a FLAVOR of edk2.
To support existing users who depend on firmware in /usr/local/share/uefi-firmware
create compatibility symlinks. The packaging list appears to be generated
correctly, however the code as it is doesn't install the files under uefi-firmware.
Update sysutils/bhyve-firmware to depend on edk2@bhyve .