Allow enabling ANGLE for GAME_MODE_STANDARD

For b/210469739, we need to be able to enable ANGLE by default for
games specified in the Game Dashboard phenotype. To do this, the
device config will be updated to include: mode=1,useAngle=true for the
necessary packages. This indicates to the GameManager that ANGLE is
enabled for GameManager.GAME_MODE_STANDARD.

Tested with:
    adb shell device_config put game_overlay $PACKAGE_NAME mode=1,useAngle=true

Bug: b/210686699
Test: atest CtsAngleIntegrationHostTestCases
Change-Id: Ib723005a01109a74e597b5c06dd9f1a692967184