testimage: disable build tests for qemumips and qemumips64
It's not uncommon for qemumips[64] builds on the Yocto Project
autobuilder to fail during Sanity Tests after a very long timeout
period. This is due to the MIPS emulation in QEMU being slow and
some of the build tests taking a very long time on MIPS machines.
This patch works around this slowness by disabling the more
complex build tests for QEMU MIPS machines.
[YOCTO #10340]
Signed-off-by: Joshua Lock <joshua.g.lock@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
