usb: dwc3: fix power collapse recovery

Exiting power collapse sequence was missing reset of the wrapper.
As a result, some registers contained invalid values at this time
(instead of the default reset values) which caused enumeration to
fail when reconnecting the device.

CRs-Fixed: 660328
Change-Id: Ia27ed5e500fb7eb00f6001d109e9ccb12a39c076
Signed-off-by: Gilad Broner <gbroner@codeaurora.org>