ARM: dts: msm: Update QUSB PHY VDD's min value to allow SVS on MSM8996

Currently QUSB PHY VDD is using nominal voltage when USB is used
in device and host mode. This change starts using SVS voltage with
QUSB PHY VDD voltage supply to allow SVS when USB is cable
connected (both in host and device mode) on MSM8996.

CRs-Fixed: 975648
Change-Id: I277e18bcf79f3cd0173e966cf22bd62cd4db3d04
Signed-off-by: Mayank Rana <mrana@codeaurora.org>