configs/qemu_aarch64_ebbr: bump u-boot and linux versions

- Bump U-Boot version to v2022.10.
- Bump Linux kernel version to v6.0.0.

Signed-off-by: Vincent Stehlé <vincent.stehle@arm.com>
Cc: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>