Move display mocking tests to DisplayServiceTests

- Move remaining display tests to new module
- Add necessary permissions

Bug: 286043820
Test: atest DisplayServiceTests
Change-Id: I242371f84185b1f770554a5ae0fbab6ed287a86f
(cherry picked from commit eeb677c9d5804dd99bc4eae11c06b170ce8767af)
Merged-In: I242371f84185b1f770554a5ae0fbab6ed287a86f
16 files changed