feat(tc): update DT for Drage GPU

This patch incorporates the changes for Drage GPU to uses new access
window interface "IRQ_AW". As the interrupt properties are different
between TC4 and other TC platforms, this patch appends the interrupt
properties in platform specific DT binding file.

Change-Id: I2ca505846f03ce64b8e5f02fd202962dbfe39f25
Signed-off-by: Leo Yan <leo.yan@arm.com>
diff --git a/fdts/tc4.dts b/fdts/tc4.dts
index ef7a080..13fabc9 100644
--- a/fdts/tc4.dts
+++ b/fdts/tc4.dts
@@ -44,3 +44,10 @@
 #include "tc-fpga.dtsi"
 #endif /* TARGET_FLAVOUR_FVP */
 #include "tc3-4-base.dtsi"
+
+/ {
+	gpu: gpu@2d000000 {
+		interrupts = <GIC_SPI 242 IRQ_TYPE_LEVEL_HIGH 0>;
+		interrupt-names = "IRQAW";
+	};
+};