arm64: dts: Add maintenance interrupt for GIC in NS2 DT

The KVM ARM64 requires GIC maintenance interrupt for VGIC emulation
so this patch adds the missing "interrupts" attribute to GIC node in
NS2 DT.
Signed-off-by: NAnup Patel <anup.patel@broadcom.com>
Reviewed-by: NRay Jui <rjui@broadcom.com>
Reviewed-by: NScott Branden <sbranden@broadcom.com>
Signed-off-by: NFlorian Fainelli <f.fainelli@gmail.com>

arch/arm64/boot/dts/broadcom/ns2.dtsi

@@ -347,6 +347,8 @@
 			      <0x65220000 0x1000>,
 			      <0x65240000 0x2000>,
 			      <0x65260000 0x1000>;
+			interrupts = <GIC_PPI 9 (GIC_CPU_MASK_RAW(0xf) |
+				      IRQ_TYPE_LEVEL_HIGH)>;
 		};
 
 		timer0: timer@66030000 {