Add a binder service to bufferhubd

First step of migrating for UDS(PDX) to Binder.
The binder interface is defined in the 'IBufferHub.aidl' file (now
empty class).

Provide with a simple test to check if the service could start normally.

Move all bufferhubd source files into a new cc_library_static build
rule.

Fixes: 115429751
Test: run "atest buffer_hub_binder_service-test". Passed.

Change-Id: I5f54796e2ff0bcf8f6827c9aeb229290ce127d42