staging: rtl8723bs: hal: Replace function rtl8723b_set_wowlan_cmd()

staging: rtl8723bs: hal: Replace function rtl8723b_set_wowlan_cmd()

Remove function rtl8723b_set_wowlan_cmd as all it does is call
rtl8723b_set_FwWoWlanRelated_cmd.
Rename rtl8723b_set_FwWoWlanRelated_cmd to rtl8723b_set_wowlan_cmd to
maintain compatibility with call site.
Issue found with Coccinelle.

Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Link: https://lore.kernel.org/r/20190725052645.2372-4-nishkadg.linux@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>