[Intel-gfx] [PATCH 49/49] drm/i915/bxt: Update max level of vswing

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5978
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -1              268/268              267/268
ILK                 -1              303/303              302/303
SNB                                  283/283              283/283
IVB                 -1              343/343              342/343
BYT                                  287/287              287/287
HSW                 -4              319/319              315/319
BDW                                  308/308              308/308
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*PNV  igt_gem_userptr_blits_minor-normal-sync      PASS(3)      DMESG_WARN(1)PASS(1)
*ILK  igt_drv_suspend_fence-restore-untiled      PASS(2)      DMESG_WARN(1)PASS(1)
*IVB  igt_gem_storedw_batches_loop_normal      PASS(2)      DMESG_WARN(1)PASS(1)
*HSW  igt_pm_rpm_cursor      PASS(2)      TIMEOUT(1)PASS(1)
*HSW  igt_pm_rpm_cursor-dpms      PASS(2)      TIMEOUT(2)
*HSW  igt_pm_rpm_debugfs-forcewake-user      PASS(2)      TIMEOUT(1)
*HSW  igt_pm_rpm_debugfs-read      PASS(2)      TIMEOUT(1)
Note: You need to pay more attention to line start with '*'