ARM: mstar: Adjust IMI size for mercury5

mercury5 family chips have 128KB of SRAM in the IMI region.
Signed-off-by: Daniel Palmer <daniel@0x0f.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/boot/dts/mercury5.dtsi

@@ -5,3 +5,7 @@
  */
 
 #include "mstar-v7.dtsi"
+
+&imi {
+	reg = <0xa0000000 0x20000>;
+};