bluetooth: correct btuart logger device node path

* modify dev/logbuffer_tty16 to dev/logbuffer_tty18

Bug: 213759828
Test: 1. Enable Bluetooth in P22 devices and check uart log in
android.hardware.bluetooth@1.1::IBluetoothHci.txt
2. Enable Bluetooth in P21 devices and check uart log in
android.hardware.bluetooth@1.1::IBluetoothHci.txt
3. Fake bthal ssrdump and check the coredump log.

Change-Id: I208fae8e5ddf60d7df52311c32249bf3ac401dbc
1 file changed