platform/x86: lenovo-yoga-tab2-pro-1380-fastcharger: Use devm_pinctrl_register_mappings()

platform/x86: lenovo-yoga-tab2-pro-1380-fastcharger: Use devm_pinctrl_register_mappings()

Use devm_pinctrl_register_mappings(), so the core automatically unregisters
the pinctrl mappings. It makes the code easier to read.

Signed-off-by: Thomas Richard <thomas.richard@bootlin.com>
Reviewed-by: Hans de Goede <hansg@kernel.org>
Link: https://lore.kernel.org/r/20250609-lenovo-yoga-tab2-pro-1380-fastcharger-devm-pinctrl-register-mappings-v1-1-fb601f2b80f6@bootlin.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>