disp: msm: dp: log the dp mst connector id information

Logging connector id will help debug the issues related to
DP MST stability and pre-merge tests. This change will log
the DP MST connector IDs modified during stability tests.

Change-Id: Ifaf8e319697a809b02c24c473acec8da521286e2
Signed-off-by: Sankeerth Billakanti <sbillaka@codeaurora.org>