payloads/edk2: Update default branch for MrChromebox repo to 2024-08

Update the default branch used for MrChromebox's edk2 fork from 2023-09
to 2024-08. This updated branch has been rebased on the latest upstream
stable tag (edk2-stable202408), and updates the EFI filesystem drivers
which had been causing some issues with bootable USBs created using
Rufus as it tried to unload the filesystem drivers and load its own.

TEST=build/boot google boards link, panther, lulu, reef, ampton, akemi,
banshee, zork, dewatt, frostflow with edk2 payload selected.

Change-Id: I459b668345ed2a34e198e6a3d3a2da94b2940e69
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/84293
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

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