Make companion callback calls oneway

These were never meant to be 2way, and are calling application callbacks,
from system server which can potentially take long time.

Thses should not be sensitive to ordering with any other IPCs, so moving them
from 2way to 1way should be safe.

Fixes: 147705675
Test: presubmit
Change-Id: Ie4e8941fba2c8a388697c3a42ad6ef76512eba9f