bus: mhi: host: pci_generic: Add support for IP_SW0 channels

IP_SW0 channels are used to transfer data over the networking interface
between MHI endpoint and the host. Define the channels in the MHI v1
channel config along with dedicated event rings.

Reviewed-by: Loic Poulain <loic.poulain@linaro.org>
Link: https://lore.kernel.org/r/20230519135803.13850-1-manivannan.sadhasivam@linaro.org


Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>