Added dummy Lights to the Light HAL default implementation

Most of the VTS tests for the Light HAL involve looping over
the list of Light objects returned by Lights::getLights(), but
the current default implementation of this function returns no
Light objects. Lights::getLights() was changed to create a few
dummy Light objects when called. Lights::setLightStatus() was
also changed to determine whether a given Light id was created
by Lights::getLights() and thus valid or not.

Test: VtsHalLightTargetTest
Bug: 240485903
Change-Id: I5ad0bdfdccacc2bde80c2dd89eaa84702f22a7fb