net: rfkill: gpio: add DT support

Allow probing rfkill-gpio via device tree. This hooks up the already
existing support that was started in commit 262c91ee ("net:
rfkill: gpio: prepare for DT and ACPI support") via the "rfkill-gpio"
compatible, with the "name" and "type" properties renamed to "label"
and "radio-type", respectively, in the device tree case.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Link: https://lore.kernel.org/r/20230102-rfkill-gpio-dt-v2-2-d1b83758c16d@pengutronix.de


Signed-off-by: Johannes Berg <johannes.berg@intel.com>