usb: dwc3: Turn on memory core and periphery upon resume

Memory core and memory peripheral blocks should remain
on upon host bus suspend otherwise XHCI controller
fails to respond to XHCI commands upon host bus resume.
These memory blocks will be turned off only upon stopping
host mode or vbus off in device mode.

Change-Id: I1f53c9536b6896111707b77954d2b6cf4d227db8
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>