staging: r8188eu: remove header file odm_RegDefine11AC.h

Finally the header odm_RegDefine11AC.h is unused now.
Remove it.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20210918181904.12000-13-straube.linux@gmail.com


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