[Intel-gfx] [PATCH 8/8] drm/i915/skl: Take 90/270 rotation into account in watermark calculations

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5877
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -2              278/278              276/278
ILK                                  308/308              308/308
SNB                 -1              284/284              283/284
IVB                 -1              380/380              379/380
BYT                                  294/294              294/294
HSW                                  387/387              387/387
BDW                 -1              316/316              315/316
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
 PNV  igt_gen3_render_linear_blits      FAIL(5)NRUN(1)DMESG_WARN(1)PASS(9)      FAIL(2)
 PNV  igt_gen3_render_mixed_blits      FAIL(8)PASS(9)      FAIL(2)
*SNB  igt_gem_fence_thrash_bo-write-verify-y      PASS(5)      DMESG_WARN(1)PASS(1)
*IVB  igt_gem_storedw_batches_loop_secure-dispatch      PASS(3)      DMESG_WARN(1)PASS(1)
*BDW  igt_gem_gtt_hog      PASS(19)      DMESG_WARN(1)PASS(1)
Note: You need to pay more attention to line start with '*'