ARM: vexpress/ca9: Add unified-cache property to l2 cache node

Commit d9d1f3e2d711 ("ARM: l2c: check that DT files specify the required
"cache-unified" property") mandates to specify this required property.
Without this property, we get this boot warning:

"L2C: device tree omits to specify unified cache"

This patch adds "cache-unified" property to L2 cache node in vexpress
CA9 device tree.

Signed-off-by: Robert Schwebel <[e-mail]>
Acked-by: Sudeep Holla <[e-mail]>
Signed-off-by: Arnd Bergmann <[e-mail]>

arch/arm/boot/dts/vexpress-v2p-ca9.dts

···
 		compatible = "arm,pl310-cache";
 		reg = <0x1e00a000 0x1000>;
 		interrupts = <0 43 4>;
+		cache-unified;
 		cache-level = <2>;
 		arm,data-latency = <1 1 1>;
 		arm,tag-latency = <1 1 1>;