[Intel-gfx] [PATCH 4/4] drm/i915: Don't expose ARGB1555 on gen2/3

[shuang.he at intel.com]

Tested-By: Intel Graphics QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 6420
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -1              272/272              271/272
ILK                 -1              302/302              301/302
SNB                 -3              315/315              312/315
IVB                 -11              343/343              332/343
BYT                                  287/287              287/287
BDW                                  317/317              317/317
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*PNV  igt at gem_fence_thrash@bo-write-verify-threaded-none      PASS(2)      FAIL(1)
*ILK  igt at kms_render@direct-render      PASS(2)      FAIL(1)
*SNB  igt at kms_cursor_crc@cursor-size-change      PASS(2)      FAIL(1)
*SNB  igt at pm_rpm@cursor      PASS(2)      FAIL(1)
 SNB  igt at pm_rpm@dpms-mode-unset-non-lpsp      DMESG_WARN(8)PASS(1)      DMESG_WARN(1)
(dmesg patch applied)WARNING:at_drivers/gpu/drm/i915/intel_uncore.c:#assert_device_not_suspended[i915]()@WARNING:.* at .* assert_device_not_suspended+0x
*IVB  igt at kms_cursor_crc@cursor-128x128-onscreen      PASS(2)      FAIL(1)
*IVB  igt at kms_cursor_crc@cursor-128x128-random      PASS(2)      FAIL(1)
*IVB  igt at kms_cursor_crc@cursor-128x128-sliding      PASS(2)      FAIL(1)
*IVB  igt at kms_cursor_crc@cursor-256x256-offscreen      PASS(2)      FAIL(1)
*IVB  igt at kms_cursor_crc@cursor-256x256-onscreen      PASS(2)      FAIL(1)
*IVB  igt at kms_cursor_crc@cursor-256x256-sliding      PASS(2)      FAIL(1)
*IVB  igt at kms_cursor_crc@cursor-64x64-offscreen      PASS(2)      FAIL(1)
*IVB  igt at kms_cursor_crc@cursor-64x64-onscreen      PASS(2)      FAIL(1)
*IVB  igt at kms_cursor_crc@cursor-64x64-random      PASS(2)      FAIL(1)
*IVB  igt at kms_cursor_crc@cursor-64x64-sliding      PASS(2)      FAIL(1)
*IVB  igt at kms_cursor_crc@cursor-size-change      PASS(2)      FAIL(1)
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