pixelstats: lastmeal read of evt cnt and max curr

Add lastmeal.csv entries for evt cnt and max curr

Test: cmd stats print-logs && logcat | grep <stat_id>
Bug: 334599839
Change-Id: Ibdea77609a5552fa06f640d81bc087d549c17deb
Signed-off-by: Hiroshi Akiyama <hiroshiakiyama@google.com>