sh: add high impedance mode management for SIUA pins on sh7722
This improves power management for the SIUA controller on sh7722. Similar patches might be desired for other SIU-enabled SH platforms. Signed-off-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de> Acked-by: NMagnus Damm <damm@opensource.se> Signed-off-by: NPaul Mundt <lethal@linux-sh.org>
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