Implement Direct Channel Tests

Implements Direct Channel tests for Sensors HAL 2.0. The tests verify
that the interface has been implemented correctly and that expected
values are returned. These tests are not intended to verify that the
rate at which sensor events are generated is correct.

Also, correctly return -1 as the channel handle if direct report is
not supported.

Bug: 115969174
Test: Tests pass against default implementation
Change-Id: I31b3211268701665757b03d5ee4ba2316f461282