Add AIDL API for PowerHAL to send session updates with FMQ

This patch adds a set of APIs to PowerHAL to enable hint session
communication via FMQ, to reduce both binder overhead and call latency
moving forward.

Bug: 315894228
Test: atest VtsHalPowerTargetTest
Change-Id: I56f89322c7706ab68e640542caf5b70eef36c451