CTS failure: android.net.cts.TrafficStatsTest#testTrafficStatsForLocalhost

CTS failure: android.net.cts.TrafficStatsTest#testTrafficStatsForLocalhost

BZ: 22053

Root cause: We should turn on the ONFIG_UID_STAT switch in arch/x86/configs/i386_mfld_defconfig
to get the specified process's traffic state.

Change-Id: I87bf3e4edc062c2669418b5850ac7da7dcc328c4
Signed-off-by: jli119X <jianpingx.li@intel.com>
Reviewed-on: http://android.intel.com:8080/40768
Reviewed-by: Monroy, German <german.monroy@intel.com>
Reviewed-by: Yang, Fei <fei.yang@intel.com>
Reviewed-by: Wood, Brian J <brian.j.wood@intel.com>
Reviewed-by: Zhang, Hongyu <hongyu.zhang@intel.com>
Reviewed-by: Li, XiaojingX <xiaojingx.li@intel.com>
Tested-by: Li, XiaojingX <xiaojingx.li@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>