Add support for virtualized APR frontend driver for audio.
Virtualized APR frontend driver resides in guest VM and
supports all legacy APR APIs. It will rely on MSM_HAB
to communicate with APR backend driver, which resides in
physical VM, where legacy SMD is utilized for communication
between APPS and ADSP.
Change-Id: I1df70a76defec17a45db93f3707c35e4fa796bc0
Signed-off-by: Timothy Sham <tsham@codeaurora.org>