JNI: Introduce a read-only property for Bluetooth library name

This improves the flexibility of loading a customized Bluetooth shared
library by reading from a read-only property, ro.system.bluetooth.library_name,
with the default library name provided.

Bug: 73505205
Test: make, enable/disable Bluetooth and perform device discovery
Change-Id: Ibdbb5cf841f24e670ec6e0416f1eb44e9aecfd1b
2 files changed