[Intel-gfx] [PATCH] drm/i915: Use DSI Pll1 for enabling MIPI DSI on Port C

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                                  364/364              364/364
ILK                 -1              364/366              363/366
SNB                 -1              448/450              447/450
IVB                                  497/498              497/498
BYT                                  289/289              289/289
HSW                                  563/564              563/564
BDW                                  417/417              417/417
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*ILK  igt_kms_flip_rcs-wf_vblank-vs-dpms-interruptible      PASS(2, M26)      DMESG_WARN(1, M26)
*ILK  igt_kms_flip_wf_vblank-ts-check      DMESG_WARN(1, M26)PASS(3, M26M37)      NSPT(1, M26)
*SNB  igt_kms_plane_plane-panning-bottom-right-pipe-A-plane-2      PASS(2, M35M22)      DMESG_WARN(1, M22)
Note: You need to pay more attention to line start with '*'