msm: ultrasound: Change memory allocation methods

Change ultrasound APSS/LPASS shared memory allocation
and mapping to use msm_audio_ion methods

Before this change, linux dma_mapping functions were used.
These functions are no longer compatible with APQ8084 because
of SMMU changes, and using them causes cache coherency issues
with the shared memory

Change-Id: I5cd87ff60aa375ca74bc13a43ccd14c1843fd6ca
Signed-off-by: Ravit Dennis <rdennis@codeaurora.org>