ipc: add audio apr virtualization support

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>