Simplify ProducerQueue::Create

This is a preparation CL that simplifies ProducerQueue's constructor,
Create(), and bufferhub_rpc::CreateProducerQueue prior to introducing
more queue attributes (is_async, width, height, max_capacity, etc) on
creation.

1/ Consolidate and/or remove unnecessary ProducerQueue::Create's
overloading (we had way too many overloads of the create function and I
figured it's awfully painful to introduce new attributes).
2/ Use UsagePolicy in ProducerQueue::Create. Also added default values
for UsagePolicy, so that empty uniform initialization gives us a default
policy. This helps us removing all ProducerQueue::Create overloading on
whether default usage policy is needed.
3/ Move |meta_size_bytes| into ProducerQueueConfig.

Bug: 38430974
Test: buffer_hub_queue_producer-test, buffer_hub_queue-test, dvr_api-test
Change-Id: Ieba9f4d1bce2162bd1e6063989985afc8d014dc7