libtimeinstate: add tests to presubmit

Run libtimeinstate_test in presubmit for libtimeinstate changes.

Test: atest --test-mapping frameworks/native/libs/cputimeinstate;
confirm that libtimeinstate_test runs & passes
Bug: 138317993
Change-Id: Ide638de1062c3b5b7fc7c4e969f3030e4264a846
Signed-off-by: Connor O'Brien <connoro@google.com>