DM: tpm emulator to communicate with swtpm

This patch will create control channel and command channel
so as to communicate with swtpm. Based on the 2 channels,
a set of APIs will be implemented and exposed.

Tracked-On: #1924
Signed-off-by: Deng Wei <wei.a.deng@intel.com>
Signed-off-by: Qi Yadong <yadong.qi@intel.com>
Signed-off-by: yingbinx <yingbinx.zeng@intel.com>
Reviewed-by: Zhu Bing <bing.zhu@intel.com>
Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>
Acked-by: Yin Fengwei <fengwei.yin@intel.com>

Author: YadongQi

devicemodel/Makefile

@@ -82,6 +82,7 @@ SRCS += hw/platform/acpi/acpi.c
 SRCS += hw/platform/acpi/acpi_pm.c
 SRCS += hw/platform/rpmb/rpmb_sim.c
 SRCS += hw/platform/rpmb/rpmb_backend.c
+SRCS += hw/platform/tpm/tpm_emulator.c
 SRCS += hw/platform/debugexit.c
 SRCS += hw/pci/wdt_i6300esb.c
 SRCS += hw/pci/lpc.c