Now that bhyve(8) supports UART, bvmconsole and bvmdebug are no longer needed.
In addition to removing the kernel bits of bvmdebug and bvmconsole, this removes
the -b and -g flag from bhyve(8). These two flags were marked as 'will be
deprecated in a future version' when they were introduced.
Mentioned in PR: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233230