generic: 5.15: copy config and patch from 5.10

Copy config and patches from kernel 5.10 to kernel 5.15

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>

target/linux/generic/pending-5.15/435-mtd-add-routerbootpart-parser-config.patch

@@ -0,0 +1,38 @@
+From 4437e01fb6bca63fccdba5d6c44888b0935885c2 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Thibaut=20VAR=C3=88NE?= <hacks@slashdirt.org>
+Date: Tue, 24 Mar 2020 11:45:07 +0100
+Subject: [PATCH] generic: routerboot partition build bits (5.4)
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This patch adds routerbootpart kernel build bits
+
+Signed-off-by: Thibaut VARÈNE <hacks@slashdirt.org>
+---
+ drivers/mtd/parsers/Kconfig  | 9 +++++++++
+ drivers/mtd/parsers/Makefile | 1 +
+ 2 files changed, 10 insertions(+)
+
+--- a/drivers/mtd/parsers/Kconfig
++++ b/drivers/mtd/parsers/Kconfig
+@@ -195,3 +195,12 @@ config MTD_REDBOOT_PARTS_READONLY
+ 	  'FIS directory' images, enable this option.
+ 
+ endif # MTD_REDBOOT_PARTS
++
++config MTD_ROUTERBOOT_PARTS
++	tristate "RouterBoot flash partition parser"
++	depends on MTD && OF
++	help
++	 MikroTik RouterBoot is implemented as a multi segment system on the
++	 flash, some of which are fixed and some of which are located at
++	 variable offsets. This parser handles both cases via properly
++	 formatted DTS.
+--- a/drivers/mtd/parsers/Makefile
++++ b/drivers/mtd/parsers/Makefile
+@@ -13,3 +13,4 @@ obj-$(CONFIG_MTD_AFS_PARTS)		+= afs.o
+ obj-$(CONFIG_MTD_PARSER_TRX)		+= parser_trx.o
+ obj-$(CONFIG_MTD_SHARPSL_PARTS)		+= sharpslpart.o
+ obj-$(CONFIG_MTD_REDBOOT_PARTS)		+= redboot.o
++obj-$(CONFIG_MTD_ROUTERBOOT_PARTS)		+= routerbootpart.o