DO NOT MERGE: Fix max supported users to 4

AOSP default supported users is 1, and it will cause CtsMediaHostTestCases test module done false for it did not support
multip user.

Enlarge the max supported users to 4 same with OEM image.

Bug: 347122747
Bug: 341021867
Bug: 351133538
Test: adb shell pm get-max-users
(cherry picked from https://android-review.googlesource.com/q/commit:a43d7360b6cf39442872f22f1dcebb1874cf5765)
Merged-In: I8950b92c692d76f5926bd2aaa5b25c7c2395c086
Change-Id: I8950b92c692d76f5926bd2aaa5b25c7c2395c086