Use intent-filter to enforce that only a single ANGLE APK is present

In order to support multiple ANGLE builds (Google-signed,
AOSP unsigned, OEM-signed), we will use intent-filter to
indicate that ANGLE is installed.   During CTS testing,
we will verify that only a single ANGLE is installed and
provides the necessary functionality.

Bug: 120487920
Test: Verify ANGLE CTS hostside tests pass.
Change-Id: If3491475e776e26b3656c377d2b28c0c8bb66da2