Implement default functions for direct channel

Implements default functions for a Sensors 2.0 HAL that does not
support direct channel operation.

Although Sensors 2.0 supports direct channel operation, it is not a
requirement unless a device supports High Fidelity Sensors. A direct
channel implementation is vendor-specific, and therefore, the default
implementation does not provide a reference implementation.

A default implementation is able to be found in Sensors 1.0 since
direct channel operation has not changed between Sensors 1.0 and 2.0.

Bug: 111070257
Test: Builds
Change-Id: I1c4ef0cd9d4bd4b7ae3212358f9493c28c2798f4