ARM: shmobile: lager: Correct setting of ethernet PHY LED mode

The correct binding is "micrel,led-mode", not "led-mode".

This corrects an error which was introduced when setting of ethernet PHY
LED mode was added by 82e62182d59bd1d0 ("ARM: shmobile: lager: Set ethernet
PHY LED mode").

This makes the lager code consistent with the koelsch code which was added
by ae00d12a032490b3 ("ARM: shmobile: koelsch: Set ethernet PHY LED mode").
Acked-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7790-lager.dts

@@ -213,7 +213,7 @@
 		reg = <1>;
 		interrupt-parent = <&irqc0>;
 		interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
-		led-mode = <1>;
+		micrel,led-mode = <1>;
 	};
 };