staging: r8188eu: make two functions static

The functions UpdateBrateTbl() and UpdateBrateTblForSoftAP() are only
used in rtw_mlme_ext.c. Make them static.

Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220908130915.8406-4-straube.linux@gmail.com


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