msm: ipa4: adapt ipa_wigig code to data buffers shared CB

This change adapts ipa_wigig code to context banks sharing between
11AD HW and IPA HW. Due to CB sharing there is no need to SMMU
map data buffers: remove SMMU mapping related code of data buffers in
case of shared CB. The buffers mapping is done by the wigig driver and
IPA may use the IOVAs without any additional mapping.
A DTS file change is needed to enable the context banks sharing.

Change-Id: I168d2db193460e554370ad46550fdc0b40ea01d0
Signed-off-by: Amir Levy <alevy@codeaurora.org>