Report AUTO_SELECTION as a smart selection event.

This is so other TCs can have access to the smart indices fore each
event.
Note that TRON logs remain unchanged.

Bug: 132290431
Test: Manually verified.
      > adb shell setprop log.tag.androidtc VERBOSE
      > adb shell stop && adb shell start
      > adb logcat -s "SelectionSessionLogger"
      Use a custom text classifier
      Observe that events in the same session as an AUTO_SELECTION event
      log the AUTO_SELECTION events indices as their smart indices.

Change-Id: I109e6e71afc50a02fd81930f5ff1ec86dc47a039