[Intel-gfx] [PATCH] drm/i915: Ignore DRM_MODE_FLAG_DBLCLK flag with DP

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5698
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -1              353/353              352/353
ILK                                  200/200              200/200
SNB                                  400/422              400/422
IVB              +1                 485/487              486/487
BYT                                  296/296              296/296
HSW                                  507/508              507/508
BDW                 -1              401/402              400/402
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*PNV  igt_gen3_render_linear_blits      PASS(6, M25M23M7)      CRASH(1, M23)
 IVB  igt_gem_storedw_batches_loop_normal      DMESG_WARN(7, M34M4M21)PASS(18, M34M4M21)      PASS(1, M21)
 BDW  igt_gem_pwrite_pread_uncached-pwrite-blt-gtt_mmap-performance      DMESG_WARN(2, M28)PASS(7, M30M28)      DMESG_WARN(1, M28)
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