IOC mediator: initialize IOC mediator

IOC mediator main functionality is transfer data between native CBC char
devices and virtual UART, it is implemented as full virtualization, Guest
OS can reuse native CBC driver directly.

Signed-off-by: Liu Yuan <yuan1.liu@intel.com>
Reviewed-by: Wang Yu <yu1.wang@intel.com>
Reviewed-by: Liu Shuo <shuo.a.liu@intel.com>
Reviewed-by: Zhao Yakui <yakui.zhao@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

Author: yliu80

devicemodel/Makefile

@@ -63,6 +63,7 @@ SRCS += hw/platform/uart_core.c
 SRCS += hw/platform/block_if.c
 SRCS += hw/platform/ioapic.c
 SRCS += hw/platform/cmos_io.c
+SRCS += hw/platform/ioc.c
 SRCS += hw/pci/wdt_i6300esb.c
 SRCS += hw/pci/lpc.c
 SRCS += hw/pci/xhci.c