pinctrl: sunxi: Add NAND pinmuxes

NAND is always at function 2 on port C.

Pin lists and mux values were taken from the Linux drivers.

Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
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