USB: dwc3: Add support for ZLP handling for control endpoint

If the control data length is multiple of endpoint zero maximum
packet size, DWC3 gadger driver is not sending zero length packet
to inform Host of end of data transfer. Due to this, USB enumeration
will fail. Hence add support for handling ZLP in case of control
data length that is mulitple endpoint maximum packet size.

CRs-Fixed: 465540
Change-Id: I139e4798be46c5a3e1e6a6d10fa3cd425301a1eb
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>