[Intel-gfx] [PATCH 2/2] drm/i915/skl: Support for 90/270 rotation

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 6091
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -4              270/270              266/270
ILK                                  303/303              303/303
SNB                 -1              304/304              303/304
IVB                                  337/337              337/337
BYT                                  287/287              287/287
HSW                                  361/361              361/361
BDW                                  309/309              309/309
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
 PNV  igt at gem_userptr_blits@coherency-sync      CRASH(2)PASS(2)      CRASH(2)
*PNV  igt at gem_fence_thrash@bo-write-verify-threaded-none      PASS(2)      FAIL(1)PASS(1)
*PNV  igt at gem_fence_thrash@bo-write-verify-x      PASS(2)      FAIL(1)PASS(1)
*PNV  igt at gem_fence_thrash@bo-write-verify-y      PASS(2)      FAIL(1)PASS(1)
*SNB  igt at kms_rotation_crc@sprite-rotation      PASS(3)      FAIL(1)PASS(1)
Note: You need to pay more attention to line start with '*'