Revert "netfilter: fib: check correct rtable in vrf setups"

This reverts commit 3502b1a2 which is
commit 05ef7055 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: I5cd8320012dc4a5e9f3257124af4b2ff1792bc40
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>