dcc_parser: Add offset option for stand alone parser use cases

Current DCC SRAM programming starts from an offset location. For
parsing stand alone DCC SRAM bin file the parser needs to be aware
of the start location of the configuration.

Change-Id: Ica6fef3dc6ed76851f026b248555fc16748f33b2

dcc_parser/dcc_parser.py

@@ -92,6 +92,9 @@ def read_config(config_pt):
         #word size
         track_len = 4
 
+    if options.config_offset is not None:
+        config_pt.seek(options.config_offset, 1)
+
     while True:
         word = config_pt.read(4)
         if len(word) != 4:
@@ -223,6 +226,8 @@ if __name__ == '__main__':
                       help='chip version')
     parser.add_option('--v2', dest='version', action="store_const", const='2',
                       help='DCC driver version 2')
+    parser.add_option('--config-offset', dest='config_offset', type=int,
+                      help='Start offset for DCC configuration')
 
     (options, args) = parser.parse_args()