ARM: dts: msm: remove bus voting for audio iommu clients

Bus voting for Audio use cases will be done by LPASS and hence
there is no need for explicitely vote for bus from APSS side.
Remove bus voting for IOMMU usage from audio clients.

CRs-fixed: 622959
Change-Id: Icad90b74924bb09829c47af10b4f8e31db4f3884
Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>