bpf: merge block.c into netd.c

Since this is just a special case of a bpf cgroup hook,
it really should be in netd.o with all other such hooks.

Besides moving/renaming the map & programs this should be a no-op.

Test: TreeHugger, atest bpf_existence_test
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I4a2aedaf77f89a9c0a96fa1c369d80659535eabe
8 files changed