Add wait to CompatChangesPreInstallOverrideTest before checking appcompat flags MUST_SLEEP Bug: 328387519 (cherry picked from https://googleplex-android-review.googlesource.com/q/commit:75ff59eb0950df48a624d48af0d747371752486e) Merged-In: I570bf772b5094e1ccd2d1d3ee794073381d9b26e Change-Id: I570bf772b5094e1ccd2d1d3ee794073381d9b26e