This change initializes the blocking notifier while registering a new extcon device. Without this a warning is observed when CONFIG_LOCKDEP is enabled since it is not as per lockdep annotation, as the driver is trying to register a non-static key. Change-Id: Ibb20fe11c4622ffd92f02508ffae5a4fb5625019 Signed-off-by: Pratham Pratap <prathampratap@codeaurora.org>