app_process: use libhidlbase

libhwbinder symbols are moving into libhidlbase for memory/performance.
This change is preparing for this (and also to avoid a merge conflict).
Later changes will be added to remove dependencies on libhwbinder once
it is no longer required.

Bug: 134961554
Test: N/A
Change-Id: I128a007749356d4a8d75eba3e2c678c0f66c59fe