Add a wrapper to convert SOF API calls to Zephyr equivalents. This allows
development to continue in parallel with xtos/HAL and Zephyr RTOSes until
parity is reached.
The initlial Zephyr APIs to be used are HAL, boot, IRQs, scheduling and
memory. The wrapper reflects this and will probably grow until feature
parity is reached when it can be deleted (as Zephyr APIs can be used
directly).
Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>