overlays: mira220 vana supply must be lower case

Author: philippe baetens

arch/arm/boot/dts/overlays/mira220-overlay.dts

@@ -74,7 +74,7 @@
 		       <&csi_frag>, "target:0=",<&csi0>,
 		       <&clk_frag>, "target:0=",<&cam0_clk>,
 		       <&cam_node>, "clocks:0=",<&cam0_clk>,
-		       <&cam_node>, "VANA-supply:0=",<&cam0_reg>;
+		       <&cam_node>, "vana-supply:0=",<&cam0_reg>;
 	};
 };