[Intel-gfx] [PATCH v2 3/3] drm/i915/dp: move TPS3 logic to where it's used

[shuang.he at intel.com]

Tested-By: Intel Graphics QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 7269
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
ILK                                  253/253              253/253
SNB                                  248/248              248/248
IVB                                  281/281              281/281
BYT                 -2              234/234              232/234
HSW                                  317/317              317/317
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*BYT  igt at gem_partial_pwrite_pread@reads      PASS(1)      FAIL(1)
*BYT  igt at gem_partial_pwrite_pread@reads-uncached      PASS(1)      FAIL(1)
Note: You need to pay more attention to line start with '*'