staging: r8188eu: remove hal/odm_RegConfig8188E.c

All remaining functions in hal/odm_RegConfig8188E.c are only used
in hal/HalHWImg8188E_BB.c. Make them static and remove the now empty
file hal/odm_RegConfig8188E.c and the header odm_RegConfig8188E.h.

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/20220926173243.8767-4-straube.linux@gmail.com


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