va: Delete the display lock/unlock when we call VA-API.
According to the VA-API's description, they are MT-safe, we do not need to care about that in our middleware layer. The lock/unlock operations have overhead and make the performance lower.
According to the VA-API's description, they are MT-safe, we do not need to care about that in our middleware layer. The lock/unlock operations have overhead and make the performance lower.