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Skip tests when the drm scheme is not installed
Not all drm hal implmentations will be present on every device, but the vendor modules will be. This change allows tests to be skipped when a drm hal implementation isn't present. Test: drm vts tests pass with widevine on a gms device (tests executed) and tests pass on an aosp device (tests skipped). Change-Id: I0b87f501a45103960193279eb5b4b2cd1c113acd