bpf: eliminate DEFAULT_BPFLOADER_(MIN|MAX)_VER

Afterwards:
  git grep 'DEFAULT_BPFLOADER_(MIN|MAX)_VER'
comes up empty

Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I9c7736c2c247987263e40c336bdea3a135cfda9a
2 files changed