The Settings GUI is being removed from the AOSP build to turn the ANGLE
APK into essentially a container APK containing the necessary libraries.
This reduces the APK size and reduces the risk of users enabling ANGLE
by accident.

Additionally, ANGLE is being marked product-specific to remove it from
all AOSP builds.

Bug: b/187345862
Change-Id: I6e1acb9c6e07b419d40aee43d7260060027999ec
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2876213Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Tim Van Patten <timvp@google.com>