ARM: dts: armv7-m: add unit name to interrupt-controller

Add unit name to nvic to remove the following warning:
 Warning (unit_address_vs_reg): Node /nv-interrupt-controller has a reg or ranges property, but no unit name

Also correct the node name to 'interrupt-controller'
while changing the line.
Signed-off-by: Joachim Eastwood <manabian@gmail.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Stefan Agner <stefan@agner.ch>

arch/arm/boot/dts/armv7-m.dtsi

 #include "skeleton.dtsi"
 
 / {
-	nvic: nv-interrupt-controller  {
+	nvic: interrupt-controller@e000e100  {
 		compatible = "arm,armv7m-nvic";
 		interrupt-controller;
 		#interrupt-cells = <1>;