Add 'bluez-firmware' package to images

All RPi models which have wireless, also have bluetooth, so add the
firmware package to those images so that the hardware is supported.

Also remove the 'Extra' from the wireless firmware comment.

raspi_master.yaml

@@ -80,6 +80,7 @@ steps:
     - __LINUX_IMAGE__
     - __RASPI_FIRMWARE__
     - __WIRELESS_FIRMWARE__
+    - __BLUETOOTH_FIRMWARE__
     tag: tag-root
     unless: rootfs_unpacked