Update the QEMU shipped u-boot.e500 image built from U-Boot mainline
v2021.07 release, which added eTSEC support to the QEMU ppce500 target,
via the following U-Boot series:

  http://patchwork.ozlabs.org/project/uboot/list/?series=233875&state=*

The cross-compilation toolchain used to build the U-Boot image is:
https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/x86_64/10.1.0/x86_64-gcc-10.1.0-nolibc-powerpc-linux.tar.xz



Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>