android: configs: Add CONFIG_NETFILTER_XT_TARGET_IDLETIMER

Signed-off-by: Ashish Sharma <ashishsharma@google.com>
(cherry picked from commit 5621df1091c7e103bca6cdd1dbecf4333efad4e7)

Change-Id: I3104266fa648fc024fee45f1ce9800142898baf7
Git-commit: f024263397cfaca5e2e97a27d9db424a42432eaf
Git-Repo: https://android.googlesource.com/kernel/common.git


Signed-off-by: Ian Maund <imaund@codeaurora.org>