ARM: shmobile: armadillo-reference dts: Seiko Instruments, Inc is "sii"

Use "sii,s35390a" instead of "seiko,s35390a", cfr.
Documentation/devicetree/bindings/i2c/trivial-devices.txt and
Documentation/devicetree/bindings/vendor-prefixes.txt.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Acked-by: NUlrich Hecht <ulrich.hecht+renesas@gmail.com>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7740-armadillo800eva-reference.dts

@@ -180,7 +180,7 @@
 &i2c2 {
 	status = "okay";
 	rtc@30 {
-		compatible = "seiko,s35390a";
+		compatible = "sii,s35390a";
 		reg = <0x30>;
 	};
 };