drm/radeon/kms: enable unmappable vram for evergreen

Evergreen now has blit support, but unmappable vram support
was disabled in c919b371cb734f42b1130e706ecee262f8d9261d
(drm/radeon/kms: avoid corner case issue with unmappable vram V2)
due to merge ordering.  This re-enables unmappable vram on
evergreen.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/evergreen_blit_kms.c b/drivers/gpu/drm/radeon/evergreen_blit_kms.c
index 086b9b0..ac3b6dd 100644
--- a/drivers/gpu/drm/radeon/evergreen_blit_kms.c
+++ b/drivers/gpu/drm/radeon/evergreen_blit_kms.c
@@ -495,6 +495,7 @@
 		dev_err(rdev->dev, "(%d) pin blit object failed\n", r);
 		return r;
 	}
+	rdev->mc.active_vram_size = rdev->mc.real_vram_size;
 	return 0;
 }
 
@@ -502,6 +503,7 @@
 {
 	int r;
 
+	rdev->mc.active_vram_size = rdev->mc.visible_vram_size;
 	if (rdev->r600_blit.shader_obj == NULL)
 		return;
 	/* If we can't reserve the bo, unref should be enough to destroy