kernel-ci: blacklist mustang big endian booting from v3.10 kernels
kernel-ci: blacklist mustang big endian booting from v3.10 kernels

lsk-v3.10 big endian boot test on mustang is failing. LSK team commented
that we didn't do much for arm64 big endian in v3.10 and suggested to
blacklist the test from v3.10.

Tested this patch with lsk-v3.10 and lsk-v3.14 builds. BE boot test job
was skipped on v3.10 successfully, and created on v4.10 as before.

Signed-off-by: Chase Qi <b576c99868e2b2b48955860cebe7615ed820f405@linaro.org>

kernelci/lava-ci-staging,kernelci/lava-ci-staging,kernelci/lava-ci-staging