drm/amd/display: Remove PRE_VEGA flag

We enabled this upstream by default now and no longer need the flag.

Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/Kconfig

@@ -9,14 +9,6 @@ config DRM_AMD_DC
 	  support for AMDGPU. This adds required support for Vega and
 	  Raven ASICs.
 
-config DRM_AMD_DC_PRE_VEGA
-	bool "DC support for Polaris and older ASICs"
-	default y
-	help
-	  Choose this option to enable the new DC support for older asics
-	  by default. This includes Polaris, Carrizo, Tonga, Bonaire,
-	  and Hawaii.
-
 config DRM_AMD_DC_FBC
 	bool "AMD FBC - Enable Frame Buffer Compression"
 	depends on DRM_AMD_DC