feat(mediatek): add new features of LPM

Add new functions and intefaces of LPM to support more interactions
between LPM providers and users.

Signed-off-by: James Liao <jamesjj.liao@mediatek.com>
Change-Id: I8ebbda0c0ef5be3a7a388a38c09424ebf785996f
9 files changed