Remove usage of hidden API in System UI

TelephonyManager.getSimCount()
TelephonyManager.getDefault()
TelephonyManager.from()

Bug: 111498835
Test: Manual DSDS test cases
      atest com.android.systemui.statusbar.policy

Change-Id: I676a70a5dbd2dcbdbbee6cd889ffd614dc42fb9d