staging: rtl8723bs: remove two unused functions

remove dump_drv_version() and dump_log_level() function
definitions and prototypes. Those functions are unused,
and add unnecessary wrap level to log calls.

They wrap DBG_871X_SEL_NL which will be replaced by
netdev_dbg() with coccinelle script application.

Signed-off-by: Fabio Aiuto <fabioaiuto83@gmail.com>
Link: https://lore.kernel.org/r/2e8dd88c053735daed95701140b2f03b4cfe2a2e.1618325614.git.fabioaiuto83@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>