Revert "bpf: Move bpf map owner out of common struct"

This reverts commit f13441c1 which is
commit fd1c98f0 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I16becec87158f42f97c509788df4bba87660f349
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>