usb: isp1763: add peripheral mode

Besides the already host mode support add peripheral mode support for
the isp1763 IP from the isp1760 family.

Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Link: https://lore.kernel.org/r/20210513084717.2487366-10-rui.silva@linaro.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>