Revert "Bluetooth: Don't accept ConfigReq if we aren't in the BT_CONFIG state"

This reverts commit 8cb8e6f1

.

That commit introduced a regression with the Bluetooth Profile Tuning
Suite(PTS), Reverting this make sure that L2CAP is in a qualificable
state.

Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>