arm64: dts: hi3798cv200-poplar: add linux,rc-map-name for IR

It adds remote control map name for IR device, so that key event can be
reported.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>

arch/arm64/boot/dts/hisilicon/hi3798cv200-poplar.dts

@@ -170,6 +170,7 @@ &i2c2 {
 };
 
 &ir {
+	linux,rc-map-name = "rc-hisi-poplar";
 	status = "okay";
 };