staging: rtl8723bs: include: remove typedef for struct pno_ssid

Remove typedef for struct pno_ssid as The Linux kernel coding style
guidelines discourage the use of typedefs for struct types.

Signed-off-by: Himadri Pandya <himadri18.07@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>