Hook up sxipio(4) to the generic pinctrl code. The device binding is pretty

Hook up sxipio(4) to the generic pinctrl code.  The device binding is pretty
retarded, requiring tables to map text strings to the apropriate numbers.
These tables were generated automatically from data extracted from the
Linux kernel and are kept in a separate file.  This should make it easy
to add support for more SoCs from the same family.

ok deraadt@, millert@