Log when threadpool is being used/configured and HIDL is disabled

When HIDL is disabled these threads will do nothing.
Add logs so we can see if/when services are trying to use or start the
hwbinder threadpools on those devices.

Test: launch_cvd
Bug: 324326491
Change-Id: Idbd0e3c4c80eb87a35664708cd87921dd8586c6b