[Intel-gfx] [PATCH] drm/i915: Fix broken mst get_hw_state.

[shuang.he at intel.com]

Tested-By: Intel Graphics QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 7270
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
ILK                                  253/253              253/253
SNB                                  248/248              248/248
IVB                                  281/281              281/281
BYT                                  234/234              234/234
HSW                                  317/317              317/317
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
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