Add BMC build timestamp in FFDC

Change-Id: I6fa1ce449f1dd9f06636728c6b508119cd68a6d0
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/lib/openbmc_ffdc_list.py b/lib/openbmc_ffdc_list.py
index 2359397..277aa17 100755
--- a/lib/openbmc_ffdc_list.py
+++ b/lib/openbmc_ffdc_list.py
@@ -22,6 +22,7 @@
     {
         # String Name         Command
         'FW Level': 'cat /etc/os-release',
+        'FW Timestamp': 'cat /etc/timestamp',
     },
     'BMC DATA':
     {