bpf: remove DEFAULT_BPF_PROG_(SELINUX_CONTEXT|PIN_SUBDIR)

This hasn't ever been useful.

Afterwards:
  git grep 'DEFAULT_BPF_PROG_(SELINUX_CONTEXT|PIN_SUBDIR)'
comes up empty

Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I7694d0bb3aa4e424247da7f79251412ff549ce63
1 file changed