drm/vc4: Add CTM registers to debugfs

Now that we set the OLED* registers to do CTM, it's helpful to have them
in the register dump.

Signed-off-by: Stefan Schake <stschake@gmail.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20180420122545.40014-2-stschake@gmail.com

drivers/gpu/drm/vc4/vc4_hvs.c

@@ -58,6 +58,10 @@ static const struct {
 	HVS_REG(SCALER_DISPSTAT2),
 	HVS_REG(SCALER_DISPBASE2),
 	HVS_REG(SCALER_DISPALPHA2),
+	HVS_REG(SCALER_OLEDOFFS),
+	HVS_REG(SCALER_OLEDCOEF0),
+	HVS_REG(SCALER_OLEDCOEF1),
+	HVS_REG(SCALER_OLEDCOEF2),
 };
 
 void vc4_hvs_dump_state(struct drm_device *dev)