ACL: Switch to GD thread to prevent race condition of accessing map

ACL_ReadConnectionAddress(), ACL_ReadPeerConnectionAddress() and
ACL_GetAdvertisingSetConnectedTo() are invoked in bt_main_thread/
bt_jni_thread, they iterate le_connection_map, but gd_stack_thread
will modify the map when LE link connects or disconnects.

Post tasks to GD thread to prevent race condition of accessing map

Bug: 373764860
Test: m com.android.btservices
Change-Id: Idfd05af0d01725e56ec53ab9525d370fbd5c644d