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SCIF modules which have SCSPTR can output the break signal. Now that we have a way of determining port features/capabilities, add trivial break control via SCSPTR support. Tested on sh7757lcr. Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Reviewed-by: Simon Horman <horms@verge.net.au> Signed-off-by: Paul Mundt <lethal@linux-sh.org>