buildroot

configs/snps_axs*: bump U-Boot to 2016.11

With this commit we upgrade U-Boot version to 2016.11 in
"snps_axs101_defconfig" and "snps_axs103_defconfig".

Important fixes: new version fixes U-Boot build for arc700.  Since
gcc-6.x "-marc700" option is no longer supported, "-mcpu=arc700"
should be used instead.

We haven't sent it before as we were waiting for U-Boot 2016.11
release.

Signed-off-by: Vlad Zakharov <vzakhar@synopsys.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>