Write separate boot system_reason fields to statsd

Android boot system_reason can sometimes be a comma separated value. For example:

"reboot,ota,update"

This change reports these sub reasons separately.

Change-Id: If990a8f034b833f342bd2799bd6a3a1b0cbf4080
Bug: 380017314
Flag: EXEMPT see b/380017314
1 file changed