Update javadoc to say that setPermittedInputMethods only restricts the
IMEs inside the profile when called by a Profile Owner. In the past, a
Profile Owner could restrict the IMEs used across the entire device.
Change-Id: If1df3509327ef131a21db5645d9e2378622800e6
Bug: 124291520
Test: atest android.admin.cts.DevicePolicyManagerTest