Bump to U-Boot 2021.10-rc5 (#1556)

The bump to U-Boot 2021.10-rc5 also makes quite some patches obsolete
since they are already part of U-Boot.

This also removes a patch which disables framebuffer support on
Raspberry Pi: Framebuffer support seems to work fine in todays
U-Boot/Linux combination. It can help debug boot problems on Raspberry
Pi devices. Without the patch framebuffer support will be enabled by
default.

buildroot-external/board/asus/tinker/patches/uboot/0002-pmic-enable-LDO2-vcc33_mipi-at-bootup.patch

@@ -1,7 +1,7 @@
-From f9195bc5cb18f71117f6efc1c352209e62c53706 Mon Sep 17 00:00:00 2001
-Message-Id: <f9195bc5cb18f71117f6efc1c352209e62c53706.1617731428.git.stefan@agner.ch>
-In-Reply-To: <983121a741192153492a61befc0e0fc61b9f8b14.1617731428.git.stefan@agner.ch>
-References: <983121a741192153492a61befc0e0fc61b9f8b14.1617731428.git.stefan@agner.ch>
+From 4c09e7741c219ef28be912e97a986b6402290c9b Mon Sep 17 00:00:00 2001
+Message-Id: <4c09e7741c219ef28be912e97a986b6402290c9b.1632758899.git.stefan@agner.ch>
+In-Reply-To: <e18419a214ba872d14462354886148f976312e3c.1632758899.git.stefan@agner.ch>
+References: <e18419a214ba872d14462354886148f976312e3c.1632758899.git.stefan@agner.ch>
 From: Pascal Vizeli <pvizeli@syshack.ch>
 Date: Fri, 24 Apr 2020 11:37:55 +0000
 Subject: [PATCH 2/2] pmic: enable LDO2 vcc33_mipi at bootup
@@ -64,5 +64,5 @@ index f85209c649..6fa1bb0c66 100644
 +}
 +#endif
 -- 
-2.31.1
+2.33.0