arm64: genet: Add bcm2711-genet-v5 compatible

Later dtb from the RPI Foundation removed the brcm,genet-v5 compatible
for some unknown reason, add brcm,bcm2711-genet-v5 to the list of compatible
device for if_genet

sys/arm64/broadcom/genet/if_genet.c

@@ -111,6 +111,7 @@ static struct ofw_compat_data compat_data[] = {
 	{ "brcm,genet-v3",		3 },
 	{ "brcm,genet-v4",		4 },
 	{ "brcm,genet-v5",		5 },
+	{ "brcm,bcm2711-genet-v5",	5 },
 	{ NULL,				0 }
 };