amdgpu: don't ask about CHASH just default it for now.

If we bump this up a level, we can ask about it, for now,
just default to what amdgpu does.

Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/lib/Kconfig

@@ -4,7 +4,8 @@ menu "AMD Library routines"
 # Closed hash table
 #
 config CHASH
-	tristate "Closed hash table"
+	tristate
+	default DRM_AMDGPU
 	help
 	 Statically sized closed hash table implementation with low
 	 memory and CPU overhead.