[Intel-gfx] [PATCH] drm/i915: Use symbolic irqreturn for ->hpd_pulse

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5631
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -1              353/353              352/353
ILK                                  353/353              353/353
SNB              +1                 399/422              400/422
IVB                                  486/487              486/487
BYT                                  296/296              296/296
HSW              +1-1              507/508              507/508
BDW              +1                 399/402              400/402
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*PNV  igt_gen3_render_linear_blits      PASS(2, M7M23)      CRASH(1, M23)
 SNB  igt_kms_flip_nonexisting-fb      NSPT(1, M35)PASS(3, M35)      PASS(1, M35)
*HSW  igt_gem_pwrite_pread_snooped-pwrite-blt-cpu_mmap-performance      PASS(3, M19M20M40)      DMESG_WARN(1, M40)
 HSW  igt_gem_storedw_loop_blt      DMESG_WARN(2, M19M20)PASS(2, M20M40)      PASS(1, M40)
 BDW  igt_gem_pwrite_pread_display-pwrite-blt-gtt_mmap-performance      DMESG_WARN(2, M28)PASS(2, M30M28)      PASS(1, M28)
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