bcm53xx: drop Linksys EA6500 V2 fix for RAM from 6.1

This patch is ready and easy to upstream but noone is willing to take
care of it. Drop it (as requested) to simplify maintenance.

Link: https://github.com/openwrt/openwrt/pull/10940#issuecomment-1318157072
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

target/linux/bcm53xx/patches-6.1/315-ARM-dts-BCM5301X-Extend-RAM-to-full-256MB-for-Linksy.patch

@@ -1,27 +0,0 @@
-From e492f69e4da879db7b3e9a2290e5b6620f1335b5 Mon Sep 17 00:00:00 2001
-From: Aleksey Nasibulin <alealexpro100@ya.ru>
-Date: Thu, 13 Oct 2022 08:16:51 +0000
-Subject: [PATCH] ARM: dts: BCM5301X: Extend RAM to full 256MB for Linksys
- EA6500 V2
-
-Linksys ea6500-v2 have 256MB of ram. Currently we only use 128MB.
-Expand the definition to use all the available RAM.
-
-Fixes: 03e96644d7a8 ("ARM: dts: BCM5301X: Add basic DT for Linksys EA6500 V2")
-Signed-off-by: Aleksey Nasibulin <alealexpro100@ya.ru>
----
- arch/arm/boot/dts/bcm4708-linksys-ea6500-v2.dts | 3 ++-
- 1 file changed, 2 insertions(+), 1 deletion(-)
-
---- a/arch/arm/boot/dts/bcm4708-linksys-ea6500-v2.dts
-+++ b/arch/arm/boot/dts/bcm4708-linksys-ea6500-v2.dts
-@@ -19,7 +19,8 @@
- 
- 	memory@0 {
- 		device_type = "memory";
--		reg = <0x00000000 0x08000000>;
-+		reg = <0x00000000 0x08000000>,
-+		      <0x88000000 0x08000000>;
- 	};
- 
- 	gpio-keys {