Bump min stack for stats_test app am: 521f60181d

Original change: https://android-review.googlesource.com/c/trusty/app/sample/+/2863503

Change-Id: I73e4030f032ab13ba22ce23ff0c85597d140f204
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>