[Intel-gfx] [PATCH] drm/i915: Reudce CHV DPLL min vco frequency to 4.8 GHz

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5845
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                                  282/282              282/282
ILK                 -1              308/308              307/308
SNB                                  326/326              326/326
IVB                                  379/379              379/379
BYT                                  294/294              294/294
HSW                 -1              387/387              386/387
BDW                 -1              316/316              315/316
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*ILK  igt_kms_flip_rcs-wf_vblank-vs-dpms-interruptible      PASS(4)      DMESG_WARN(1)PASS(1)
*HSW  igt_gem_storedw_batches_loop_normal      PASS(4)      DMESG_WARN(1)PASS(1)
*BDW  igt_gem_gtt_hog      PASS(15)      DMESG_WARN(1)PASS(1)
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