usb: dwc3: add support to skip power collapse

Adds support for skipping the power collapse flow
(dwc3_msm_config_gdsc) when peforming the suspend/disconnect
flows.
This is necessary until the device-specific flow for supporting
power collapse is implemented on each new device. As such,
usage this flag is expected to be done only in the earlier
stages of a product's life cycle.

Change-Id: Idd133664242665fecc5491d42d65e7adbe0ccaa3
Signed-off-by: Dov Levenglick <dovl@codeaurora.org>