arm: dts: mt7623: cleanup MT7623N NAND dts file

Normally, we didn't release this kind of baord to user. This specific
board exists only in the early stage of development inside MediaTek -
and that may confuse peoples.

Hence this patch removes related files accordingly.

Cc: John Crispin <john@phrozen.org>
Cc: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Acked-by: John Crispin <john@phrozen.org>
Acked-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

arch/arm/boot/dts/Makefile

@@ -1168,7 +1168,6 @@ dtb-$(CONFIG_ARCH_MEDIATEK) += \
 	mt7623a-rfb-emmc.dtb \
 	mt7623a-rfb-nand.dtb \
 	mt7623n-rfb-emmc.dtb \
-	mt7623n-rfb-nand.dtb \
 	mt7623n-bananapi-bpi-r2.dtb \
 	mt8127-moose.dtb \
 	mt8135-evbp1.dtb

arch/arm/boot/dts/mt7623n-rfb-nand.dts

@@ -1,73 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (c) 2017 MediaTek Inc.
- * Author: John Crispin <john@phrozen.org>
- *
- */
-
-/dts-v1/;
-#include "mt7623n-rfb.dtsi"
-
-/ {
-	model = "MediaTek MT7623N NAND reference board";
-	compatible = "mediatek,mt7623n-rfb-nand", "mediatek,mt7623";
-};
-
-&bch {
-	status = "okay";
-};
-
-&nandc {
-	status = "okay";
-	pinctrl-names = "default";
-	pinctrl-0 = <&nand_pins_default>;
-
-	nand@0 {
-		reg = <0>;
-		spare_per_sector = <64>;
-		nand-ecc-mode = "hw";
-		nand-ecc-strength = <12>;
-		nand-ecc-step-size = <1024>;
-
-		partitions {
-			compatible = "fixed-partitions";
-			#address-cells = <1>;
-			#size-cells = <1>;
-
-			partition@0 {
-				label = "preloader";
-				reg = <0x0 0x40000>;
-			};
-
-			partition@40000 {
-				label = "uboot";
-				reg = <0x40000 0x80000>;
-			};
-
-			partition@c0000 {
-				label = "uboot-env";
-				reg = <0xC0000 0x40000>;
-			};
-
-			partition@140000 {
-				label = "bootimg";
-				reg = <0x140000 0x2000000>;
-			};
-
-			partition@2140000 {
-				label = "recovery";
-				reg = <0x2140000 0x2000000>;
-			};
-
-			partition@4140000 {
-				label = "rootfs";
-				reg = <0x4140000 0x1000000>;
-			};
-
-			partition@5140000 {
-				label = "usrdata";
-				reg = <0x5140000 0x1000000>;
-			};
-		};
-	};
-};

arch/arm/boot/dts/mt7623n-rfb.dtsi

@@ -1,86 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (c) 2017 MediaTek Inc.
- * Author: John Crispin <john@phrozen.org>
- *	   Sean Wang <sean.wang@mediatek.com>
- *
- */
-
-/dts-v1/;
-#include "mt7623.dtsi"
-#include "mt6323.dtsi"
-
-/ {
-	aliases {
-		serial0 = &uart0;
-		serial1 = &uart1;
-		serial2 = &uart2;
-	};
-
-	chosen {
-		stdout-path = "serial2:115200n8";
-	};
-
-	cpus {
-		cpu0 {
-			proc-supply = <&mt6323_vproc_reg>;
-		};
-
-		cpu1 {
-			proc-supply = <&mt6323_vproc_reg>;
-		};
-
-		cpu2 {
-			proc-supply = <&mt6323_vproc_reg>;
-		};
-
-		cpu3 {
-			proc-supply = <&mt6323_vproc_reg>;
-		};
-	};
-
-	memory@80000000 {
-		device_type = "memory";
-		reg = <0 0x80000000 0 0x40000000>;
-	};
-
-	usb_p1_vbus: regulator-5v {
-		compatible = "regulator-fixed";
-		regulator-name = "usb_vbus";
-		regulator-min-microvolt = <5000000>;
-		regulator-max-microvolt = <5000000>;
-		gpio = <&pio 135 GPIO_ACTIVE_HIGH>;
-		enable-active-high;
-	};
-};
-
-&mmc0 {
-	vmmc-supply = <&mt6323_vemc3v3_reg>;
-	vqmmc-supply = <&mt6323_vio18_reg>;
-};
-
-&mmc1 {
-	vmmc-supply = <&mt6323_vmch_reg>;
-	vqmmc-supply = <&mt6323_vmc_reg>;
-};
-
-&uart0 {
-	status = "okay";
-};
-
-&uart1 {
-	status = "okay";
-};
-
-&uart2 {
-	status = "okay";
-};
-
-&usb1 {
-	vbus-supply = <&usb_p1_vbus>;
-	status = "okay";
-};
-
-&u3phy1 {
-	status = "okay";
-};