Define PacketWakeup pushed events for statds

This patch pushes packet wakeup events collected by
NetdEventListenerService into the statds service.

Example logs from $ adb logcat -b stats
11-20 23:33:25.955   955   972 I [44]    : [10014,wlan0,34525,10:e:7e:26:3f:c1,2001:db8:400d:c0b::bc,2001:db8:4:fd00:a00a:dbc8:f5ba:4269,6,5228,49411]
11-20 23:37:05.809   955  1473 I [44]    : [10014,wlan0,2048,10:e:7e:26:3f:c1,192.168.0.142,192.168.0.39,6,443,45422]
11-20 23:42:09.233   955  1473 I [44]    : [10014,wlan0,2048,10:e:7e:26:3f:c1,192.168.12.238,192.168.0.39,6,443,40160]
11-20 23:55:28.162   955  1207 I [44]    : [10059,wlan0,34525,10:e:7e:26:3f:c1,2001:db8:4004:807::200a,2001:db8:4:fd00:a00a:dbc8:f5ba:4269,6,443,42492]
11-20 23:59:18.343   955  1888 I [44]    : [10059,wlan0,34525,10:e:7e:26:3f:c1,2001:db8:4004:807::200a,2001:db8:4:fd00:a00a:dbc8:f5ba:4269,6,443,42491]
11-21 00:00:17.952   955  3341 I [44]    : [10014,wlan0,34525,10:e:7e:26:3f:c1,2001:db8:400d:c0b::bc,2001:db8:4:fd00:a00a:dbc8:f5ba:4269,6,5228,49411]
11-21 00:13:05.552   955  1473 I [44]    : [-1,wlan0,34525,10:e:7e:26:3f:c1,2001:db8:4004:805::200a,2001:db8:4:fd00:a00a:dbc8:f5ba:4269,6,443,38098]
11-21 00:13:50.606   955  1207 I [44]    : [-1,wlan0,2048,10:e:7e:26:3f:c1,192.168.5.238,192.168.0.39,6,443,40802]

Bug: 28806131
Test: runtest frameworks-net
Change-Id: I5a3c76498a4b720f0d9308a65b5dd4b32377d0d1