arc: Implement smaller dumpstate output

Adds a -L commandline option to indicate a much smaller set of
dumpstate output safe for feedback reports.

Implements output of system logcat, event logs, networking, and dropbox
system server crash/system app crashes only.

Bug: 142684959
Bug: 136273873
Test: atest dumpstate_test
Change-Id: I1d564b949d0a44ff9cc014302d79703294a13d78