defconfig : Enable xt_multiport module for iptables

Currently iptables doesn't has support for multiport config
options and due to WFA 5.6.1 test is failing as part of QOS-R2.
This change is to enable xt_multiport modules to support
multiport config.

Change-Id: If4bfdad7b6755b5f5532ec5b21d6272d7894fe34
Signed-off-by: Balaji Pothunoori <quic_bpothuno@quicinc.com>