kernel: add support for GD25D05 SPI NOR (5.4)

This chip is used on newer RB912UAG-5HPnD r2 and 922UAGS-5HPacD boards:

Before:

[    0.824562] spi-nor spi0.0: unrecognized JEDEC id bytes: c8 40 10 c8 40 10
[    0.831607] spi-nor: probe of spi0.0 failed with error -2

After:

[    0.825347] spi-nor spi0.0: gd25d05 (64 Kbytes)
[    0.830291] 1 routerbootpart partitions found on MTD device spi0.0
[    0.836577] Creating 1 MTD partitions on "spi0.0":
[    0.841448] 0x000000000000-0x000000010000 : "partitions"
[    0.848418] 4 routerbootpart partitions found on MTD device partitions
[    0.855092] Creating 4 MTD partitions on "partitions":
[    0.860318] 0x000000000000-0x00000000c000 : "routerboot"
[    0.866548] 0x00000000c000-0x00000000d000 : "hard_config"
[    0.872832] 0x00000000d000-0x00000000e000 : "bios"
[    0.878580] 0x00000000e000-0x00000000f000 : "soft_config"

Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>

target/linux/generic/pending-5.4/482-mtd-spi-nor-add-support-for-Gigadevice-GD25D05.patch

@@ -0,0 +1,24 @@
+From d68b4aa22e8c625685bfad642dd7337948dc0ad1 Mon Sep 17 00:00:00 2001
+From: Koen Vandeputte <koen.vandeputte@ncentric.com>
+Date: Mon, 6 Jan 2020 13:07:56 +0100
+Subject: [PATCH] mtd: spi-nor: add support for Gigadevice GD25D05
+
+Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
+---
+ drivers/mtd/spi-nor/spi-nor.c | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+--- a/drivers/mtd/spi-nor/spi-nor.c
++++ b/drivers/mtd/spi-nor/spi-nor.c
+@@ -2230,6 +2230,11 @@ static const struct flash_info spi_nor_i
+ 
+ 	/* GigaDevice */
+ 	{
++		"gd25d05", INFO(0xc84010, 0, 64 * 1024,  1,
++			SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
++			SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB)
++	},
++	{
+ 		"gd25q16", INFO(0xc84015, 0, 64 * 1024,  32,
+ 			SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
+ 			SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB)