arm: Implement uniprocessor with MP config Add a boolean for indicating uniprocessors with MP extensions. This drives the U bit in MPIDR. Prepares support for Cortex-R5. Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Message-id: a70a80583df265e0174f01fa1fc92b33ea6d1db5.1434066412.git.peter.crosthwaite@xilinx.com Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>