ARM: dts: msm: Add dpdm regulator to pm8150b_charger

PM8150B charger requires a reference to USB PHY which exposes
a DPDM regulator to be enabled prior to performing charger type
detection (APSD).

Change-Id: I0cdb919f084aedb5ef573334f912f3d70269b481
Signed-off-by: Jack Pham <jackp@codeaurora.org>