selinux: tag gpu_service as app_api_service

gpu_service is already accessible to untrusted 3p apps aosp/898376.
Otherwise, vendor apps can't access gpu_service.

Bug: 139685237
Test: m selinux_policy
Change-Id: I30a951cd712b0ae4aacd2c4d6d42e74fac5c0707
1 file changed