lantiq: linux 5.4: remove support for the linux,mtd-name OF property

This is referenced in two .dts but never actually used from userspace.
Drop support for this property because it's not used and because it
makes updating to Linux 5.4 harder (as the patch doesn't apply anymore).

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>

target/linux/lantiq/files-5.4/arch/mips/boot/dts/lantiq/falcon_lantiq_easy98000-nand.dts

@@ -18,7 +18,6 @@
 		reg = <0x0 0x40000>;
 		#address-cells = <1>;
 		#size-cells = <1>;
-		linux,mtd-name = "gen_nand";
 		bbt-use-flash;
 
 		partition@0 {

target/linux/lantiq/files-5.4/arch/mips/boot/dts/lantiq/falcon_sflash-16m.dtsi

@@ -7,7 +7,6 @@
 	flash@0 {
 		compatible = "spansion,s25fl129p0", "spansion,s25fl129p1";
 		reg = <0 0>;
-		linux,mtd-name = "sflash";
 		spi-max-frequency = <80000000>;
 		m25p,fast-read;
 

target/linux/lantiq/patches-5.4/0022-MTD-m25p80-allow-loading-mtd-name-from-OF.patch

@@ -1,44 +0,0 @@
-From 4400e1f593ea40a51912128adb4f53d59e62cad8 Mon Sep 17 00:00:00 2001
-From: John Crispin <blogic@openwrt.org>
-Date: Wed, 10 Sep 2014 22:40:18 +0200
-Subject: [PATCH 22/36] MTD: m25p80: allow loading mtd name from OF
-
-In accordance with the physmap flash we should honour the linux,mtd-name
-property when deciding what name the mtd device has.
-
-Signed-off-by: Thomas Langer <thomas.langer@lantiq.com>
-Signed-off-by: John Crispin <blogic@openwrt.org>
----
- drivers/mtd/devices/m25p80.c |    6 ++++++
- 1 file changed, 6 insertions(+)
-
---- a/drivers/mtd/devices/m25p80.c
-+++ b/drivers/mtd/devices/m25p80.c
-@@ -19,6 +19,7 @@
- #include <linux/errno.h>
- #include <linux/module.h>
- #include <linux/device.h>
-+#include <linux/of.h>
- 
- #include <linux/mtd/mtd.h>
- #include <linux/mtd/partitions.h>
-@@ -173,6 +174,10 @@ static int m25p_probe(struct spi_mem *sp
- 	};
- 	char *flash_name;
- 	int ret;
-+	const char __maybe_unused	*of_mtd_name = NULL;
-+
-+	of_property_read_string(spi->dev.of_node,
-+		"linux,mtd-name", &of_mtd_name);
- 
- 	data = dev_get_platdata(&spimem->spi->dev);
- 
-@@ -211,6 +216,8 @@ static int m25p_probe(struct spi_mem *sp
- 
- 	if (data && data->name)
- 		nor->mtd.name = data->name;
-+	else if (of_mtd_name)
-+		nor->mtd.name = of_mtd_name;
- 
- 	if (!nor->mtd.name)
- 		nor->mtd.name = spi_mem_get_name(spimem);