ARM: dts: msm: Add extcon handle for ATOLL QRD

This change adds extcon handles to usb nodes. This extcon
handle is used to receive USB vbus and ID related
notifications.

Change-Id: I8b89aa6a092dcef2eb031af828fbe75c507bf4b4
Signed-off-by: Chandana Kishori Chiluveru <cchiluve@codeaurora.org>