android: configs: Add CONFIG_NETFILTER_XT_TARGET_IDLETIMER

Change-Id: I728a8a9b4581695deebada6ea9c5d34338c25bd8
Signed-off-by: Ashish Sharma <ashishsharma@google.com>
Merge "android: configs: Add CONFIG_NETFILTER_XT_TARGET_IDLETIMER" into cm-11.0