DMS: check cached mode for user apps only

Android Studio uses adb to launch a process for screen mirroring. This
kind of processes is not managed by AMS and run with uid shell or root.
In such a case, that process behaves like a gone Android app so it will
miss display events. This won't impact any normal Android apps.

Check if the uid belongs to an Android app for Android Studio.

Bug: 303684492
Test: Enable display mirroring in Android Studio and check logs
Change-Id: I3fb20327979eca8774f7ddf143b2b8f2386e6b56
Merged-In: I3fb20327979eca8774f7ddf143b2b8f2386e6b56