Make libbluetooth_hci_pdl visible to sub-packages in //vendor

This is for being able to create BT packets in a new program in vendor/google/tools/bluetooth/
Adding visibility for all sub packages is the only way allowed - not individual packages

Bug: b/307322468
Test: mmm and tested on a device
Change-Id: Id759cccdf4ee99189b5fc99ca654275dae6fefb1