powerpc: clean up ssi.txt, add definition for fsl,ssi-asynchronous
Add the definition of the fsl,ssi-asynchronous property to ssi.txt (documentation of the device tree bindings for the Freescale SSI device). Also tidy up the layout of ssi.txt. Signed-off-by: Timur Tabi <timur@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
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