Add support for the tc654 and tc655 fan controllers from Microchip.

http://ww1.microchip.com/downloads/en/DeviceDoc/20001734C.pdfSigned-off-by: NChris Packham <chris.packham@alliedtelesis.co.nz>
Acked-by: NRob Herring <robh@kernel.org>
[groeck: Fixed continuation line alignments]
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>