staging: emxx_udc: Remove unused parameter from function parameter list parameter list

struct nbu2ss_ep *ep parameter in functions _nbu2ss_ep0_in_transfer()
and _nbu2ss_ep0_out_transfer() is not used anywhere inside. Hence,
removed.

Signed-off-by: Ravi Teja Darbha <ravi2j@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>