pinctrl: -EAGAIN not supported but documented

[Ramon Fried]

Hi Linus,

Stated in Documentation/driver-api/pinctl.rst:

Since some controllers have special logic for handling entire groups of pins
they can exploit the special whole-group pin control function. The
pin_config_group_set() callback is allowed to return the error code -EAGAIN,
for groups it does not want to handle, or if it just wants to do some
group-level handling and then fall through to iterate over all pins, in 
which
case each individual pin will be treated by separate pin_config_set() 
calls as
well.

----

This is not supported, and there's no code for handling it.

Should we add the necessary code or just remove the wrong documentation.

Thanks,

Ramon