Revert "ipv6: remove max_size check inline with ipv4"

This reverts commit 95372b04 which is
commit af6d10345ca76670c1b7c37799f0d5576ccef277 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: I7e768b45f1b301807a89234d2af0fd025a13396e
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>