staging: rtl8723bs: Remove Dead Code in `struct mlme_priv`

Some Lines in the struct mlme_priv are Dead due to CONFIG_INTEL_WIDI.
This Fix removes the dead code.

Signed-off-by: Emanuel Bennici <benniciemanuel78@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>