ARM: dts: AM33XX: Corrects typo in interrupt field in SPI node

DT field of "interrupts" was mentioned wrongly as "interrupt" in SPI
node. This went unnoticed as spi-omap2 driver not making use of
interrupt. Fixes the typo.
Signed-off-by: Philip Avinash <avinashphilip@ti.com>
Acked-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: Benoit Cousson <benoit.cousson@linaro.org>

arch/arm/boot/dts/am33xx.dtsi

@@ -309,7 +309,7 @@ spi0: spi@48030000 {
 			#address-cells = <1>;
 			#size-cells = <0>;
 			reg = <0x48030000 0x400>;
-			interrupt = <65>;
+			interrupts = <65>;
 			ti,spi-num-cs = <2>;
 			ti,hwmods = "spi0";
 			status = "disabled";
@@ -320,7 +320,7 @@ spi1: spi@481a0000 {
 			#address-cells = <1>;
 			#size-cells = <0>;
 			reg = <0x481a0000 0x400>;
-			interrupt = <125>;
+			interrupts = <125>;
 			ti,spi-num-cs = <2>;
 			ti,hwmods = "spi1";
 			status = "disabled";