msm: mdss: dp: trigger link retraining on link status update

Add support for link retraining in the event of a link status
update. The link status can be updated to show the current state
of clock recovery or channel equalization, and link retraining
needs to be initiated in the case of a failure.

CRs-Fixed: 1076516
Change-Id: If68d029c87db2370f07f279aacbc51d139f00aae
Signed-off-by: Tatenda Chipeperekwa <tatendac@codeaurora.org>