[Intel-gfx] [PATCH 4/4] drm/i915: Rename no_fbc_str to no_fbc_reason

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5847
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -1              282/282              281/282
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
*PNV  igt_gem_userptr_blits_minor-sync-interruptible      PASS(2)      DMESG_WARN(1)PASS(1)
*ILK  igt_gem_fenced_exec_thrash_no-spare-fences-busy      PASS(2)      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)
Note: You need to pay more attention to line start with '*'