[Intel-gfx] [PATCH] RFC: drm: add support for tiled/compressed/etc modifier in addfb2

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5689
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                                  353/353              353/353
ILK                                  353/353              353/353
SNB                                  400/422              400/422
IVB              +2-1              485/487              486/487
BYT                                  296/296              296/296
HSW                                  507/508              507/508
BDW                                  401/402              401/402
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
 IVB  igt_gem_pwrite_pread_snooped-pwrite-blt-cpu_mmap-performance      DMESG_WARN(6, M34M21)PASS(9, M4M34)      PASS(1, M34)
 IVB  igt_gem_storedw_batches_loop_normal      DMESG_WARN(6, M34M4)PASS(16, M34M4M21)      PASS(1, M34)
 IVB  igt_gem_storedw_batches_loop_secure-dispatch      DMESG_WARN(1, M34)PASS(7, M34M4)      DMESG_WARN(1, M34)
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