android: configs: require TCPMSS, remove SCHED_TRACER and TIMER_STATS

TCPMSS is required for the Android Vpn service to correctly
handle the MTU on tun/ppp devices.  Bug: 11579326
We don't really need SCHED_TRACER and the TIMER_STATS.

Change-Id: I10c5767a6324a496713752d4fe9eff361dc8e06a
(cherry picked from commit 23f01e8e81f3c53985958fa291b39c84293ad047)

Git-commit: e89d9fc608d3c8a1cf21174a713d2ff7e88e7e00
Git-Repo: https://android.googlesource.com/kernel/common.git


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