android-tools: Don't start adbd by default at startup, it must be started by usb-moded instead

recipes-android/android-tools/android-tools/android-tools-adbd.service

+[Unit]
+Description=Android Debug Bridge
+
+[Service]
+Type=simple
+Restart=on-failure
+ExecStart=/usr/bin/adbd
+StandardOutput=null

recipes-android/android-tools/android-tools_4.2.2.bbappend

+FILESEXTRAPATHS_prepend := "${THISDIR}/android-tools:"
+
 do_configure_append() {
     sed -i "s@/system/bin/sh@/bin/sh@g" core/adbd/services.c
 }