arm64: dts: broadcom: bcm2712: Define VGIC interrupt

arm64: dts: broadcom: bcm2712: Define VGIC interrupt

Define the interrupt in the GICv2 for vGIC so KVM
can be used, it was missed from the original upstream
DTB for some reason.

Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
Cc: Andrea della Porta <andrea.porta@suse.com>
Cc: Phil Elwell <phil@raspberrypi.com>
Fixes: faa3381267d0 ("arm64: dts: broadcom: Add minimal support for Raspberry Pi 5")
Link: https://lore.kernel.org/r/20250924085612.1039247-1-pbrobinson@gmail.com
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>