Set Presence as False for all the FRUs

While priming the inventory all the frus (except the System), presence state should be false
It will be set as true when vpd collection done for that fru.

Test-
By code I could change the value of Present

root@rain148bmc:/tmp# busctl introspect  xyz.openbmc_project.Inventory.Manager /xyz/openbmc_project/inventory/system/chassis/motherboard/pcie_cable_card8|more
NAME                                          TYPE      SIGNATURE RESULT/VALUE              FLAGS
xyz.openbmc_project.Inventory.Item            interface -         -                         -
.Present                                      property  b         true                      emits-change writable
.PrettyName                                   property  s         "DBG_TESTING"             emits-change writable

root@rain148bmc:/tmp# busctl introspect  xyz.openbmc_project.Inventory.Manager /xyz/openbmc_project/inventory/system/chassis/motherboard/pcie_cable_card8
xyz.openbmc_project.Inventory.Item            interface -         -                         -
.Present                                      property  b         false

root@rain147bmc:/tmp# busctl introspect  xyz.openbmc_project.Inventory.Manager  /xyz/openbmc_project/inventory/system/chassis/motherboard/pcie_cable_card8
NAME                                          TYPE      SIGNATURE RESULT/VALUE              FLAGS
xyz.openbmc_project.Inventory.Item            interface -         -                         -
.Present                                      property  b         false                     emits-change writable

root@rain147bmc:/tmp# busctl introspect  xyz.openbmc_project.Inventory.Manager  /xyz/openbmc_project/inventory/system/chassis/motherboard/lcd_op_panel_hill
NAME                                     TYPE      SIGNATURE RESULT/VALUE           FLAGS
xyz.openbmc_project.Inventory.Item       interface -         -                      -
.Present                                 property  b         false                  emits-change writable

Change-Id: I8f60c453761cd5d524b5f47aaf0228f72560d6a7
Signed-off-by: Alpana Kumari <alpankum@in.ibm.com>
diff --git a/ibm_vpd_app.cpp b/ibm_vpd_app.cpp
index f723613..d865ba5 100644
--- a/ibm_vpd_app.cpp
+++ b/ibm_vpd_app.cpp
@@ -473,6 +473,11 @@
 
             if (!isSystemVpd && !itemEEPROM.value("noprime", false))
             {
+                inventory::PropertyMap presProp;
+                presProp.emplace("Present", false);
+                interfaces.emplace("xyz.openbmc_project.Inventory.Item",
+                                   move(presProp));
+
                 if (itemEEPROM.find("extraInterfaces") != itemEEPROM.end())
                 {
                     for (const auto& eI : itemEEPROM["extraInterfaces"].items())