ACPI: thinkpad-acpi: consolidate wlsw notification function

Rename tpacpi_input_send_radiosw() to tpacpi_send_radiosw_update(), and
make it a central point to issue "radio switch changed state" notifications
by consolidating also the poll() notification in the same function.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>