drm/msm/dp: update Display Port AUX initialization sequence

Program the AUX configuration registers before enabling the AUX
module as per the h/w recommended sequence. Add memory barrier
during AUX reset to make sure reset happens before enabling
the AUX module.

Change-Id: Id4da0078a4a30aaff19ab24ee7de16563939e0d1
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>
5 files changed