arm64: dts: rockchip: rename rfkill label for Radxa ROCK 5B

on ROCK 5B, there is no PCIe slot, instead there is a M.2 slot.
rfkill pin is not exclusive to PCIe devices, there is SDIO Wi-Fi
devices.

rename rfkill label from "rfkill-pcie-wlan" to "rfkill-m2-wlan", it
matches with rfkill-bt.

Fixes: 82d40b14 ("arm64: dts: rockchip: add rfkill node for M.2 Key E WiFi on rock-5b")
Reviewed-by: Dragan Simic <dsimic@manjaro.org>
Signed-off-by: FUKAUMI Naoki <naoki@radxa.com>
Fixes: 82d40b14 ("arm64: dts: rockchip: add rfkill node for M.2 Key  E WiFi on rock-5b")
Link: https://lore.kernel.org/r/20241128120631.37458-1-naoki@radxa.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>