usb: gadget: cdns3: Fix missing cache operations for non-zero Endpoints

usb: gadget: cdns3: Fix missing cache operations for non-zero Endpoints

Transfer initiation and completion for the non-zero Endpoints are
handled by cdns3_ep_run_transfer() and cdns3_transfer_completed()
respectively.

Failing to flush the cache associated with the TRB Pool within
cdns3_ep_run_transfer() results in the transfers never being initiated.
Similarly, failing to invalidate the cache associated with the TRB pool
within cdns3_transfer_completed() results in the transfers never being
completed.

Fix this.

Fixes: 7e91f6ccdc84 ("usb: Add Cadence USB3 host and gadget driver")
Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Reviewed-by: Roger Quadros <rogerq@kernel.org>
Reviewed-by: Marek Vasut <marex@denx.de>