arc: Implement smaller dumpstate output

Adds a -A commandline option to indicate a much smaller set of
dumpstate output safe for ARC++ bug 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: I192be7ed841cee0a8847e1057209ef2b164bab07