run in privileged mode to allow KVM usage

.drone.yml

@@ -1,6 +1,7 @@
 pipeline:
   test:
     image: nextcloudci/android:android-5
+    privileged: true
     commands:
       - echo no | android create avd --force -n test -t $ANDROID_TARGET --abi $ANDROID_ABI -c 20M
       - emulator -avd test -no-skin -no-audio -no-window &