u-boot: Update to v2023.10

Set default U-Boot revision to v2023.01 and rebase patches on top of
that. Another series about 16x32 fonts was merged upstream, so drop some
now-unnecessary patches we had for that. For the video damage tracking
series, switch to the version I'm trying to upstream.

Upstream kconfig status is a bit unstable, so updating configs with
`make oldconfig` would miss important upstream changes, since they rely
on carrying defaults via upstream defconfigs. Update the configs as
such:

- Turn old configs into defconfigs (./update project trees -s u-boot)
- Save the diff from old upstream defconfig (diffconfig $theirs $ours)
- Update U-Boot revision, rebase patches, and clean old trees
- Prepare new U-Boot tree (./update project trees -f u-boot)
- Review the diffconfigs to see if any options were renamed upstream
- Copy over the new upstream defconfigs and apply earlier diff
- Turn new defconfigs into configs (./update project trees -l u-boot)

Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>

config/u-boot/default/target.cfg

@@ -1,3 +1,3 @@
 tree="default"
-rev="62e2ad1ceafbfdf2c44d3dc1b6efc81e768a96b9" # v2023.01
+rev="4459ed60cb1e0562bc5b40405e2b4b9bbf766d57" # v2023.10
 arch="AArch64"