Do not start hciuart.service/bthelper@hci0.service if krnbt is used (#2947)

* Do not start hciuart.service if krnbt is used

Avoid starting (and failing to start) hciuart.service if krnbt is used.
This avoid unnecessary failed services showing up.

* Update buildroot-external/package/pi-bluetooth/hciuart.service

Co-authored-by: Jan Čermák <sairon@users.noreply.github.com>

* Drop duplicate bluetooth in path

* Avoid bthelper@hci0.service failing

* Revert "Avoid bthelper@hci0.service failing"

This reverts commit f79777e63e.

* Add ExecConditiono to bthelper@.service as well

---------

Co-authored-by: Jan Čermák <sairon@users.noreply.github.com>

buildroot-external/package/pi-bluetooth/bthelper@.service

@@ -6,5 +6,6 @@ Before=bluetooth.service
 
 [Service]
 Type=oneshot
+ExecCondition=/bin/sh -c '[ "$(cat /proc/device-tree/$(cat /proc/device-tree/aliases/bluetooth)/status)" != "okay" ]'
 ExecStart=/usr/bin/bthelper %I
 RemainAfterExit=yes

buildroot-external/package/pi-bluetooth/hciuart.service

@@ -5,6 +5,7 @@ After=dev-serial1.device
 
 [Service]
 Type=forking
+ExecCondition=/bin/sh -c '[ "$(cat /proc/device-tree/$(cat /proc/device-tree/aliases/bluetooth)/status)" != "okay" ]'
 ExecStart=/usr/bin/btuart
 
 [Install]