Let IMMS#updateSystemUiLocked() take a user ID

As a preparation befor making IMMS#mMenuController multi-user aware,
this CL introduces a variant of

  InputMethodManagerService#updateSystemUiLocked(),

which takes a user ID as an input parameter.

This is a mechanical refactoring CL with no behavior change expected.

Bug: 305849394
Test: presubmit
Change-Id: Ib2a93992e9abe23f1ecc9f529f25ce6dda3cb556