bridge: mrp: Extend br_mrp_fill_info

This patch extends the function br_mrp_fill_info to return also the
status for the interconnect ring.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>