staging: r8188eu: NetworkTypeInUse is not in use

NetworkTypeInUse from struct wlan_bssid_ex is not used. Remove
NetworkTypeInUse itself, the code to set it and the enum for its
possible values.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Link: https://lore.kernel.org/r/20221023170808.46233-4-martin@kaiser.cx


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