ARM: dts: msm: Add support for USB/VBUS detection on sdxhedgehog

There are two methods to detect USB/VBUS: SMB charger or PMIC
VBUS_DETECT pin on PMD9655. This change uses VBUS_DETECT pin.

Change-Id: I65f2c6fbcc1c4de5f21a06397903c95eae061071
Signed-off-by: Vicky Wallace <vwallace@codeaurora.org>