linux-phytec-ti

dmaengine: ti: k3-navss-udma: add support for remote/virt udma channels

To support remote/virt UDMA channels to CPS9G which is under control of
firmware running on remote core:

- TX side: virt-net driver will access and fully control dedicated TX udma
channel. Hence, TX channel is dedicated - no changhes required on TX side.

- RX side: RX udma channel is under full control of RPC, and only dedicated
RX udma flows are allocated for Linux Host. So, when connecting to remote
UDMA channel - the UDMA RX channel should not be to touched, just dedicated
RX flows added and configured. The RX UDMA flow RX and RX FDQ rings have to
be switched to invalid rings IDs for disabling/enabling RX UDMA flow.

This patch implements above behavior.

Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>