[Intel-gfx] [PATCH] drm/i915: kill i915.powersave

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 6044
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -2              269/269              267/269
ILK                 -1              303/303              302/303
SNB                                  304/304              304/304
IVB                                  338/338              338/338
BYT                                  287/287              287/287
HSW                                  362/362              362/362
BDW                                  310/310              310/310
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*PNV  igt at gem_userptr_blits@minor-normal-sync      PASS(2)      DMESG_WARN(1)PASS(1)
 PNV  igt at gem_userptr_blits@minor-unsync-interruptible      DMESG_WARN(1)PASS(2)      DMESG_WARN(1)PASS(1)
*ILK  igt at gem_unfence_active_buffers      PASS(2)      DMESG_WARN(1)PASS(1)
Note: You need to pay more attention to line start with '*'