extract-utils: Apply relative path for apps with deep folder structures

While most apps are nicely placed in
<partition>/app/<nameofapp>/<nameofapp>.apk
or <partition>/priv-app/<nameofapp>/<nameofapp.apk>,
some such as Android Platform Services belong
in product/priv-app/GmsCore/m/independent/AndroidPlatformServices.apk.
Without this change, it is copied to
product/priv-app/AndroidPlatformServices/AndroidPlatformServices.apk.

Change-Id: I364e9a71bf0eb31942714a87343e14b2b3c5ace4
1 file changed