add context_hub into audio hal group

While implementing the capo nanoapp for audio configuration, we met
some chre socket connected error due to the access group denied.

Add context_hub group for audio hal to connect chre socket.

go/capo-algo

Bug: 141128522
Bug: 149069556
Test: FULL build with audio hal part and local prebuilts nanoapp.
Test: Audio HAL communicates normally with CHRE socket.
Change-Id: Iea84411682f4c3e08f8b37a5b21818b0e9b04983