CtsOsTestCases secondary_user

Marks this CTS test module as supporting secondary_user, meaning that
the tests are eligible to be run from a regular Android user other
than the system user (i.e. other than user 0).

Note that 'user' here refers to the concept of users in Android
Multiuser; it is NOT the same as a uid.

Bug: 172077103
Bug: 172078780
Test: atest CtsOsTestCases --user-type secondary_user
Change-Id: Ic9a9f5151d33a32d783d38b880fd470df24bacf2