ARM: mstar: Wire up smpctrl for SSD201/SSD202D

Add the specific compat string for the smpctrl registers to the
SSD201/SSD202D common dtsi.

Signed-off-by: Daniel Palmer <daniel@0x0f.com>
Link: https://lore.kernel.org/r/20201201134330.3037007-10-daniel@0x0f.com'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/boot/dts/mstar-infinity2m-ssd20xd.dtsi

@@ -5,3 +5,8 @@
  */
 
 #include "mstar-infinity2m.dtsi"
+
+&smpctrl {
+	compatible = "sstar,ssd201-smpctrl", "mstar,smpctrl";
+	status = "okay";
+};