ARM: dts: apq8064: fix missing gsbi cell-index

Without this i2c instance for missing cell-index nodes would fail, fix
it by adding correct cell-index.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Andy Gross <agross@codeaurora.org>

arch/arm/boot/dts/qcom-apq8064.dtsi

@@ -249,6 +249,7 @@ i2c2: i2c@124a0000 {
 		gsbi3: gsbi@16200000 {
 			status = "disabled";
 			compatible = "qcom,gsbi-v1.0.0";
+			cell-index = <3>;
 			reg = <0x16200000 0x100>;
 			clocks = <&gcc GSBI3_H_CLK>;
 			clock-names = "iface";