Merge "Add --logstats description for meminfo." into main

                pw.println("  -p: dump also private dirty memory usage.");

                pw.println("  --oom: only show processes organized by oom adj.");

                pw.println("  --local: only collect details locally, don't call process.");

                pw.println("  --logstats: dump native allocator stats to log");

                pw.println("  --package: interpret process arg as package, dumping all");

                pw.println("             processes that have loaded that package.");

                pw.println("  --checkin: dump data for a checkin");