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: I2228d9fbaa686d74c0b0f242a0156177d2b4cf84
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>