radeon: fix regression with eviction since evict caching changes

Since 0d0b3e7443bed6b49cb90fe7ddc4b5578a83a88d
drm/radeon: use cached memory when evicting for vram on non agp

evicting from TTM would try and evict to TTM instead of system,
not so good.

This should fix:
https://bugs.freedesktop.org/show_bug.cgi?id=58272

Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/radeon_object.c

@@ -96,9 +96,9 @@ void radeon_ttm_placement_from_domain(struct radeon_bo *rbo, u32 domain)
 	}
 	if (domain & RADEON_GEM_DOMAIN_CPU) {
 		if (rbo->rdev->flags & RADEON_IS_AGP) {
-			rbo->placements[c++] = TTM_PL_FLAG_WC | TTM_PL_FLAG_TT;
+			rbo->placements[c++] = TTM_PL_FLAG_WC | TTM_PL_FLAG_SYSTEM;
 		} else {
-			rbo->placements[c++] = TTM_PL_FLAG_CACHED | TTM_PL_FLAG_TT;
+			rbo->placements[c++] = TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM;
 		}
 	}
 	if (!c)