pixelstats: Use int32/64 in Pixel MM health metrics

Change to int32/64 since westworld doesn't
supports uint32/64.

Bug: 173101018
Test: adb shell cmd stats print-stats | grep 10501[56]
Test: adb shell cmd stats print-stats | grep 10502[45]
Test: adb shell cmd stats print-logs
      adb logcat | grep -e 10501[56] -e 10502[45]
Signed-off-by: Chiawei Wang <chiaweiwang@google.com>
Change-Id: Iceb1aa1dd52f501de6c90bf4ec56afb786f91dea
1 file changed