CHROMIUM: ipu3-imgu: Remove cache synchronization

IPU3 runs in coherent DMA mode by default. No need to do
cache synchronization. This patch removes the cache
sync operations.

Signed-off-by: Tianshu Qiu <tian.shu.qiu@intel.com>

BUG=b:63850250
TEST=Test WF & UF camera functionality on Soraka

Change-Id: I4200f7b727cbab29e0a0f10657cf722e429942b7
Signed-off-by: Chiranjeevi Rapolu <chiranjeevi.rapolu@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/648258
Commit-Ready: Ricky Liang <jcliang@chromium.org>
Tested-by: Ricky Liang <jcliang@chromium.org>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
1 file changed