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Lukasz Laguna 5ebda99d78 drm/xe/vf: Disable CSC support on VF

[ Upstream commit f62408efc8 ]

CSC is not accessible by VF drivers, so disable its support flag on VF
to prevent further initialization attempts.

Fixes: e02cea83d3 ("drm/xe/gsc: add Battlemage support")
Signed-off-by: Lukasz Laguna <lukasz.laguna@intel.com>
Cc: Alexander Usyskin <alexander.usyskin@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://lore.kernel.org/r/20250729123437.5933-1-lukasz.laguna@intel.com
(cherry picked from commit 552dbba1ca)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>