Since Python 2.7 is obsolete and we need to update the bhyve ports
to a newer version now, remove all CSM support. from this and other
Update the uefi-edk2-bhyve port to hash 5e9a8a6dfb152472c5d12a3940069b16c774f0fc
which includes the latest build fix committed on November 13th.
I don't see any further need for the -devel port, so delete it.
I've updated the Makefile to follow the style in sysutils/edk2.