Revert "bareudp: Pull inner IP header in bareudp_udp_encap_recv()."

This reverts commit 76851c70 which is
commit 45fa29c8 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: I2cd4b7f3ead433ca9e912c3cefd82695ba99d0ea
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>