[AudioProxy] Support Audio HAL 7.0

Support Audio HAL 7.0. Most of the works are done when supporting 7.1.
This patch:
1. Add a new service binary for 7.0.
2. Change the sepolicy file contexts to use regex to match different
   service binaries.

Bug: 216559597
Test: On device test
Change-Id: I3c83bcd005d84d05890eed544a78d09c9099c8d9
4 files changed