In Q, mainline modules will can add atoms after the platform ships.
Statsdstats now supports atom counts of up to 100 atoms that are added
after Q ships. Note: pixel/oem pushed atoms will also get counted now.
Also fixes a typo in prepareFirstBucket
Bug: 131448746
Bug: 128363379
Test: statsd_test
Change-Id: I149c91136fb7649f0c9a0d6e83bc20f8461e45e2