payloads/U-Boot: Use github mirror and latest version

Update the U-Boot version to the latest release. Also switch to github
since it is typically much faster to download than the existing URL.

Drop the 'experimental' tag since this payload is pretty stable. It is
also tested regularly in U-Boot's CI.

Change-Id: I082130539c3474593a82e4b21cb995380f4db168
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77149
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77463
Reviewed-by: Patrick Georgi <patrick@coreboot.org>
Tested-by: Patrick Georgi <patrick@coreboot.org>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>

0 files changed, 0 insertions, 0 deletions