mhi: dev: net_dev: add support for reserve side coalesced (rsc) channel

RSC channel allows hardware to combine multiple small IP packets
into a single jumbo IP packet before transferring to host. Also,
RSC operate in parallel with legacy IP_HW0 channels. This change
add support for RSC by linking rsc device into IP_HW0 device.

CRs-Fixed: 2361266
Change-Id: I20c74acb203527a9e71a2654784ccd2803ebfb32
Signed-off-by: Sujeev Dias <sdias@codeaurora.org>