ARM: dts: msm: Enable USB0 VBUS on APQ8084 Liquid

The usb0_vreg regulator controls the 5V VBUS for use in host
mode on the primary OTG port. Enable it for the &usb3 device.

CRs-fixed: 624939
Change-Id: Ia0490220d8fbc45a1188c9c00c090183c2d801ff
Signed-off-by: Jack Pham <jackp@codeaurora.org>