OvmfPkg/Bhyve: rename files to remove 'Pkg' infix

OvmfPkg/Bhyve: rename files to remove 'Pkg' infix

OvmfPkg is the package, so while there are files to build bhyve
separately, they shouldn't have 'Pkg' in the name.

Signed-off-by: Rebecca Cran <rebecca@bsdio.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: Peter Grehan <grehan@freebsd.org>
Message-Id: <20200818021035.6479-1-rebecca@bsdio.com>
Reviewed-by: Peter Grehan <grehan@freebsd.org>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>