Revert "bpf: Defer the free of inner map when necessary"

This reverts commit 90c44579 which is
commit 87667336 upstream.

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

Bug: 161946584
Change-Id: I8c7820bcca06e847cdc7c894005d383a2ac828a0
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>