Allow location providers also outside of /system

[georgeto]

As described in the last passage of https://github.com/microg/android_packages_apps_GmsCore/wiki/Installation:

Note: On Android 7 (or later) an additional patch is needed to make location work, or alternatively, you can install GmsCore.apk in the /system/priv-app folder.

[JuniorJPDJ]

.