config: arm: msm: Enable NETFILTER_XT_TARGET_HARDIDLETIMER

For fast dormancy/tcm feature, network idle timer support is required
where in timer expires even in power colapse and which triggers a
sysfs notification. If a matching packet is received then timer is
reset. This support is required in the kernel so enabling the config

Change-Id: I2a2db6deeebbb124b5d586ee04b090fe00501f08
Signed-off-by: Ravinder Konka <rkonka@codeaurora.org>