acpi_panasonic: Clear wireless RF_KILL on boot and resume

On Panasonic FZ-Y1 and similar models, the EC latches RF_KILL on
shutdown and suspend when battery is at certain level, causing wireless
to boot with hard block.

Call WLSW.SHRF during attach and resume to clear the block.

Tested on Panasonic FZ-Y1 with Intel Wireless 7265.

Reviewed by: adrian, obiwac
Approved by: adrian, obiwac
Differential Revision: https://reviews.freebsd.org/D55265