drm/ci: ignore Gamma test failures on Qualcomm SC7180

It seems, on SC7180 color conversion results are not included into the
CRC calculation (unlike SM8350). The fails for SC7180 already lists CTM
tests. Add gamma-related tests too.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Acked-by: Daniel Stone <daniels@collabora.com>
Patchwork: https://patchwork.freedesktop.org/patch/699820/
Link: https://lore.kernel.org/r/20260121-dpu-sc7180-ignore-gamma-v1-1-84f2cc2beeb1@oss.qualcomm.com

Author: lumag

drivers/gpu/drm/ci/xfails/msm-sc7180-trogdor-kingoftown-fails.txt

@@ -6,12 +6,16 @@ kms_color@ctm-green-to-red,Fail
 kms_color@ctm-negative,Fail
 kms_color@ctm-red-to-blue,Fail
 kms_color@ctm-signed,Fail
+kms_color@gamma,Fail
+kms_color@legacy-gamma,Fail
 kms_cursor_legacy@cursor-vs-flip-toggle,Fail
 kms_cursor_legacy@cursor-vs-flip-varying-size,Fail
 kms_flip@flip-vs-modeset-vs-hang,Fail
 kms_flip@flip-vs-panning-vs-hang,Fail
 kms_lease@lease-uevent,Fail
 kms_pipe_crc_basic@compare-crc-sanitycheck-nv12,Fail
+kms_plane@pixel-format,Fail
+kms_plane@pixel-format-source-clamping,Fail
 kms_plane_alpha_blend@alpha-7efc,Fail
 kms_plane_alpha_blend@coverage-7efc,Fail
 kms_plane_alpha_blend@coverage-vs-premult-vs-constant,Fail

drivers/gpu/drm/ci/xfails/msm-sc7180-trogdor-lazor-limozeen-fails.txt

@@ -6,12 +6,16 @@ kms_color@ctm-green-to-red,Fail
 kms_color@ctm-negative,Fail
 kms_color@ctm-red-to-blue,Fail
 kms_color@ctm-signed,Fail
+kms_color@gamma,Fail
+kms_color@legacy-gamma,Fail
 kms_cursor_legacy@cursor-vs-flip-toggle,Fail
 kms_cursor_legacy@cursor-vs-flip-varying-size,Fail
 kms_flip@flip-vs-modeset-vs-hang,Fail
 kms_flip@flip-vs-panning-vs-hang,Fail
 kms_lease@lease-uevent,Fail
 kms_pipe_crc_basic@compare-crc-sanitycheck-nv12,Fail
+kms_plane@pixel-format,Fail
+kms_plane@pixel-format-source-clamping,Fail
 kms_plane_alpha_blend@alpha-7efc,Fail
 kms_plane_alpha_blend@coverage-7efc,Fail
 kms_plane_alpha_blend@coverage-vs-premult-vs-constant,Fail