hw/i386/vmport: Add support for CMD_GET_VCPU_INFO

Command currently returns that it is unimplemented by setting
the reserved-bit in it's return value.

Following patches will return various useful vCPU information
to guest.

Reviewed-by: Nikita Leshenko <nikita.leshchenko@oracle.com>
Signed-off-by: Liran Alon <liran.alon@oracle.com>
Message-Id: <20200312165431.82118-13-liran.alon@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

include/hw/i386/vmport.h

@@ -13,6 +13,7 @@ typedef enum {
     VMPORT_CMD_VMMOUSE_DATA     = 39,
     VMPORT_CMD_VMMOUSE_STATUS   = 40,
     VMPORT_CMD_VMMOUSE_COMMAND  = 41,
+    VMPORT_CMD_GET_VCPU_INFO    = 68,
     VMPORT_ENTRIES
 } VMPortCommand;