ARM: shmobile: Remove Lager reference DTS

Now that the DTS file r8a7790-lager.dts can be used with board-lager.c
and board-lager-reference.c, proceed with removing
r8a7790-lager-reference.dts.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

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

-/*
- * Device Tree Source for the Lager board
- *
- * Copyright (C) 2013 Renesas Solutions Corp.
- *
- * This file is licensed under the terms of the GNU General Public License
- * version 2.  This program is licensed "as is" without any warranty of any
- * kind, whether express or implied.
- */
-
-/dts-v1/;
-#include "r8a7790.dtsi"
-#include <dt-bindings/gpio/gpio.h>
-
-/ {
-	model = "Lager";
-	compatible = "renesas,lager-reference", "renesas,r8a7790";
-
-	chosen {
-		bootargs = "console=ttySC6,115200 ignore_loglevel rw";
-	};
-
-	memory@40000000 {
-		device_type = "memory";
-		reg = <0 0x40000000 0 0x80000000>;
-	};
-
-	memory@180000000 {
-		device_type = "memory";
-		reg = <1 0x80000000 0 0x80000000>;
-	};
-
-	lbsc {
-		#address-cells = <1>;
-		#size-cells = <1>;
-	};
-
-	leds {
-		compatible = "gpio-leds";
-		led6 {
-			gpios = <&gpio4 22 GPIO_ACTIVE_HIGH>;
-		};
-		led7 {
-			gpios = <&gpio4 23 GPIO_ACTIVE_HIGH>;
-		};
-		led8 {
-			gpios = <&gpio5 17 GPIO_ACTIVE_HIGH>;
-		};
-	};
-
-	fixedregulator3v3: fixedregulator@0 {
-		compatible = "regulator-fixed";
-		regulator-name = "fixed-3.3V";
-		regulator-min-microvolt = <3300000>;
-		regulator-max-microvolt = <3300000>;
-		regulator-boot-on;
-		regulator-always-on;
-	};
-};
-
-&pfc {
-	pinctrl-0 = <&scif0_pins &scif1_pins>;
-	pinctrl-names = "default";
-
-	scif0_pins: serial0 {
-		renesas,groups = "scif0_data";
-		renesas,function = "scif0";
-	};
-
-	scif1_pins: serial1 {
-		renesas,groups = "scif1_data";
-		renesas,function = "scif1";
-	};
-
-	mmc1_pins: mmc1 {
-		renesas,groups = "mmc1_data8", "mmc1_ctrl";
-		renesas,function = "mmc1";
-	};
-};
-
-&mmcif1 {
-	pinctrl-0 = <&mmc1_pins>;
-	pinctrl-names = "default";
-
-	vmmc-supply = <&fixedregulator3v3>;
-	bus-width = <8>;
-	non-removable;
-	status = "okay";
-};