USB: dwc3: Disable ssusb PHY LDOs and VDDCX in suspend

Currently not disabling ssusb PHY LDOs during cable connect
which could cause power consumption. Hence disable these
LDOs and vote for ssusb VDDCX.

Change-Id: I80e9880e22fdeff8168a9fa5ccd694f9a3e1a891
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>