[Intel-gfx] [PATCH 5/5] drm/i915: Organize bind_vma funcs

[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                 -1              364/364              363/364
ILK              +1-1              365/366              365/366
SNB                                  450/450              450/450
IVB                 -1              498/498              497/498
BYT                                  289/289              289/289
HSW                                  564/564              564/564
BDW                                  417/417              417/417
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*PNV  igt_gem_tiled_partial_pwrite_pread_writes      PASS(2, M25M23)      NO_RESULT(1, M23)
*ILK  igt_kms_flip_rcs-flip-vs-panning      PASS(2, M26)      DMESG_WARN(1, M26)
 ILK  igt_kms_flip_wf_vblank-ts-check      DMESG_WARN(2, M26)PASS(18, M26M37)      PASS(1, M26)
*IVB  igt_kms_cursor_crc_cursor-64x64-sliding      FAIL(1, M21)NSPT(4, M34)PASS(2, M34M21)      DMESG_WARN(1, M21)
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