gst-plugin-bluetooth: remove systemd service file

The service file should be included in bluez4 package, not in plugin package.

This solves the following warning:

WARNING: QA Issue: gst-plugin-bluetooth: Files/directories were installed but not shipped
  /lib
  /lib/systemd
  /lib/systemd/system
  /lib/systemd/system/bluetooth.service [installed-vs-shipped]

(From OE-Core rev: e1767c2f39e690c40c5d53d3b6d9e9706ceb10cd)

Signed-off-by: Chong Lu <Chong.Lu@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-connectivity/bluez/gst-plugin-bluetooth_4.101.bb

@@ -25,6 +25,7 @@ do_install_append() {
   	rm -rf ${D}${libdir}/alsa-lib
   	rm -rf ${D}${datadir}
 	rm -rf ${D}${includedir}
+	rm -rf ${D}${nonarch_base_libdir}
 }
 
 FILES_${PN} = "${libdir}/gstreamer-0.10/lib*.so"