travis: do not waste time cloning unused submodules
Builds only require: - dtc - keycodemapdb - capstone Signed-off-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org> [AJB: drop wget cache] Signed-off-by: NAlex Bennée <alex.bennee@linaro.org> Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com>
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