Implement a.h.audio.common@7.0-util module

This includes a rewrite of HidlUtils for V7.
A unit test is added for its conversion functions.

Made necessary minor adjustments to the HAL V7 types.
Also, fixed definition of 'audioFormatsList' to allow for
vendor extensions.

Bug: 142480271
Bug: 173647783
Test: m && atest android.hardware.audio.common@7.0-util_tests
Change-Id: Ib883f1c246fce78c004846516699aa724d4b5d44
Merged-In: Ib883f1c246fce78c004846516699aa724d4b5d44