test-qemu.sh: use expect script based on configuration name

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
build.sh: add non-interactive reconfiguration

Useful for e.g. randconfig + KCONFIG_ALLCONFIG specialization.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
build.sh: rename toolchain base directpry

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
test-qemu.sh: add lx60 and kc705 machines

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>