Move the parsing of the DT config right above probe().

Allocate the state container for the driver in probe()
instead of inside the DT config parsing function: as a
result return an int instead of a pointer.

Drop the check for !np: we can only probe from DT right
now so no risk of ending up here.

Cc: Peter Rosin <peda@axentia.se>
Cc: Chris Lesiak <chris.lesiak@licor.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20211206020423.62402-1-linus.walleij@linaro.orgSigned-off-by: Guenter Roeck <linux@roeck-us.net>