staging: r8188eu: make odm_ConfigMAC_8188E() static

The function odm_ConfigMAC_8188E() is only used in HalHWImg8188E_MAC.c.
Make it static.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Link: https://lore.kernel.org/r/20220926173243.8767-2-straube.linux@gmail.com


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