ARM: dts: msm: Add uAB connector support for SM6150

This change adds extcon handle to support uAB connector
on SM6150. In case of uAB connector charger driver provides
extcon notifications whereas for Type-C connector case PD
driver provides extcon notifications.

Change-Id: Ic86b5efad4a0cf747771fc92bb458c07eb709263
Signed-off-by: Pratham Pratap <prathampratap@codeaurora.org>