Added OemComputerSystems and properties for provisioning

 - Added OemComputerSystems Schema for provisioning properties
 - Added "ProvisioningStatus" Oem property with EnumType
    1) NotProvisioned
    2) ProvisionedButNotLocked
    3) ProvisionedAndLocked

Intel secures platform firmware components using Intel PFR mechanism.
This may differ for other Oem's(non-intel platforms) but the properties
like Provisioned, Locked states should be of generic as per NIST SP
800-193. Added build time flag to enable/disable PFR supported platforms.

Tested:
 - By default provisioning feature is OFF, using GET method on below URI
verified Oem Property and observed no such property. This is default
behaviour on upstream.

URI: /redfish/v1/Systems/system
Response: No "Oem" property.

 - Enabled provisioning feature in Intel platforms and Verified using Systems
URI. Ran the redfish validator tool and no new issues found due to this
change.
URI: /redfish/v1/Systems/system
RESPONSE:
.....

"Oem": {
        "OpenBmc": {
            "FirmwareProvisioning": {
                "ProvisioningStatus": "NotProvisioned"
            }
        }
    }
.....

Signed-off-by: AppaRao Puli <apparao.puli@linux.intel.com>
Change-Id: I674e6075263f4fa2962637d3add47393a1ff0c0b
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 40b5706..956e173 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -71,6 +71,12 @@
     '/redfish/v1/Systems/system/LogServices/EventLog/Entries'."
     OFF
 )
+option (
+    BMCWEB_ENABLE_REDFISH_PROVISIONING_FEATURE
+    "Enable provisioning feature support in redfish. Paths are under
+    '/redfish/v1/Systems/system/'."
+    OFF
+)
 
 # Insecure options.  Every option that starts with a BMCWEB_INSECURE flag should
 # not be enabled by default for any platform, unless the author fully
@@ -359,6 +365,8 @@
     -DBMCWEB_ENABLE_REDFISH_DBUS_LOG_ENTRIES>
     $<$<BOOL:${BMCWEB_INSECURE_ENABLE_REDFISH_FW_TFTP_UPDATE}>:
     -DBMCWEB_INSECURE_ENABLE_REDFISH_FW_TFTP_UPDATE>
+    $<$<BOOL:${BMCWEB_ENABLE_REDFISH_PROVISIONING_FEATURE}>:
+    -DBMCWEB_ENABLE_REDFISH_PROVISIONING_FEATURE>
 )
 
 # configure and install systemd unit files