Update am/OWNERS to remap some tests.

Add a couple wild cards to some per-file Owner mappings so the related
tests files are mapped to the owners, as well.

ex.
ProcessRecordTests.java now gets mapped to ACTIVITY_MANAGER_OWNERS
ProcessStateControllerTest.java now gets mapped to OOM_ADJUSTER_OWNERS

Flag: EXEMPT only changing OWNERS
Bug: n/a
Test: n/a
Change-Id: I9ace87b147b562104b8a38831e02f33ee29f3cc4