ARM: dts: msm: Allow DP-DM lines voting for charger detection

USB data lines must be in high impedance or float state to
ensure USB PHY doesn't interfere with charger detection by PMIC.
Add dpdm-supply (exposed by PHY driver) to charger node to
allow charger driver vote for data lines using this regulator.

Change-Id: I5ac177299c77108a5b796d18eb6e2bd9481b7309
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>