Bluetooth: drivers: Sync bus types with BlueZ

The authoritative source of these values is BlueZ:

https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/lib/hci.h#n38



Update our values with the above. The IPM definiton doesn't exist in
BlueZ, but should be added there to make sure we don't get out of sync
again.

Signed-off-by: Johan Hedberg <johan.hedberg@silabs.com>