ieee802154: ca8210: Get platform data via dev_get_platdata()

Access to platform data via dev_get_platdata() getter to make code cleaner.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/20250305105656.2133487-3-andriy.shevchenko@linux.intel.com


Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>