Refactor PowerHalController and add a binding for composition data

This patch refactors some of the calls to use the "hal::" syntax used
elsewhere for ADPF, and adds (currently unused) wrappers for
sending composition data.

Bug: 360908317
Flag: EXEMPT refactor
Test: atest libpowermanager_test
Change-Id: Ib9b2fec37b8e1431ba2c4ba0658db658f28429fa