disp: msm: dp: Detect failure cases when setting mst topology manager

The mst topology manager set may fail for various
reasons. Ensure that the return codes are checked
and stop execution when failure cases are
detected.

CRs-Fixed: 2520932
Change-Id: I95c4caf403d0960525d931bf67560e800a3691ae
Signed-off-by: Fuad Hossain <fhossain@codeaurora.org>