usb: gadget: hsic: Add support for VDDCX corner voting

This change add support in ci13xxx_msm_hsic driver and
ehci-msm-hsic driver for VDDCX corner voting.
In case a VDDCX corner resource is supported by the platform,
it will be used. Else, the legacy voting for specific voltage
level will be used.

Change-Id: Iae91d1c945f9b61340628b2fc7c7727e4cca6a1e
CRs-Fixed: 354458
Signed-off-by: Amit Blay <ablay@codeaurora.org>
Signed-off-by: David Collins <collinsd@codeaurora.org>