Replace the use of helper function IsBufferReleased to member function

IsReleased() or is_released().

Fix: 122854791
Test: BufferHub_test BufferHubServer_test VtsHalBufferHubV1_0TargetTest
buffer_hub-test buffer_hub_queue-test dvr_buffer_queue-test
on walleye_xr
Change-Id: I2431a4ddd78cb2eef9bdeafc0d9048571f7a0c61