drm/msm/dp: fix programming sequence for aux transactions

Ensure that all previous interrupt status are cleared before
triggering a new aux transaction, and do not set the
NO_SEND_STOP request bit for read transactions to align with
the hardware programming recommendations.

CRs-Fixed: 2105346
Change-Id: Icc17ac7b09d70ab5b330189be38fa32e3bff850e
Signed-off-by: Tatenda Chipeperekwa <tatendac@codeaurora.org>