ARM: mstar: Adjust IMI size for infinity3

infinity3 has 128KB of SRAM at the IMI region.
Signed-off-by: NDaniel Palmer <daniel@0x0f.com>
Signed-off-by: NArnd Bergmann <arnd@arndb.de>

arch/arm/boot/dts/infinity3.dtsi

@@ -5,3 +5,7 @@
  */
 
 #include "infinity.dtsi"
+
+&imi {
+	reg = <0xa0000000 0x20000>;
+};