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9e2edd5192
In this patch, add vuart configuration in scenario XML of each board to support communication between service VM and user VM since system shutdown feature need to send commands through this vuart communication channel. The follow changes are made in this patch: - Add multi legacy vuart for service VM for communication - Add one legacy vuart for user VM for communication - Add 8250.nr_uarts parameter in command line of service OS Tracked-On: #6652 Signed-off-by: Xiangyang Wu <xiangyang.wu@intel.com>