Remove getCurrentUser call to find an alternative

The call the framework uses to get the current user ID requires the
INTERACT_ACROSS_USERS permission, which not a lot of apps will have.
Find a better way to do that.

Bug: 76430246

Test: CtsKeystoreTestCases
Change-Id: I8a0637d351fff9cfbf40e02946325f90466b68c5
2 files changed