Do not install webview on Android >= 7.0

[phhusson]

Since Android 7, webview can be used from the Chrome APK, so there is no point in having WebViewGoogle.
Additionally, if Chrome is installed, it should disable AOSP's webview as well (Freeing > 100MB of space in system partition)

[jamuir]

Thanks for pointing this out. Sorry that no one has replied until now.

Have you made this change in your builds? and is everything working fine?

Would you be able to open a PR for this?

[phhusson]

I did the change (and it works fine), but by using Android build system's override mechanism:
https://github.com/phhusson/vendor_hardware_overlay/blob/80c4f40d67a2fd319555c82e1150cac7fe4fc979/tmp/Android.mk

I can try to make a PR if that's useful