staging: r8188eu: remove unused enum odm_bt_coexist

Remove unused enum odm_bt_coexist.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20210915110958.17743-1-straube.linux@gmail.com


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