USB: dwc3-msm: Add support for new ioctl for voltage request

Add support for new ioctls for userspace to let kernel driver
know about new voltage request being negogiated and also result
whether the request is successful or not, when HVDCP charger is
connected.

Change-Id: I9f36949fc7888274171aa1724da45a11704b7fec
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>