LWIS: add refcount to fix multiple instances

Allocator is a device level structure, so we will need to properly
refcount it for multiple clients.

Bug: 214308675
Test: atest liblyric.silo_hardware_socs_whi_drivers_g3aa_test
Signed-off-by: Holmes Chou <holmeschou@google.com>
Change-Id: Iafd72660fa498373ed0f677e79c615e0d1c778cd