Enable bzipfs support in the EFI loader.
- Add bzipfs to the list of supported filesystems in the EFI loader.
- Increase the heap size allocated for the EFI loader from 2MB to 3MB.
Differential Revision: https://reviews.freebsd.org/D2053
Reviewed by: benno, emaste, imp
MFC after: 2 weeks
Sponsored by: Cisco Systems, Inc.