Enable nimbus DD2.1 in op-build

Support DD2.1 SBE image in op-build for nimbus

Change-Id: I86cd5eccdce3b205797b5fcf8dc5607e7a6c4d22
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/45346
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Sachin Gupta <sgupta2m@in.ibm.com>

src/build/sbeOpDistribute.py

@@ -27,8 +27,8 @@
 import getopt
 
 CHIPID = 'p9n'
-p9n_EC = ['10', '20']
-DD_level = {'10':'DD1', '20':'DD2'}
+p9n_EC = ['10', '20', '21']
+DD_level = {'10':'DD1', '20':'DD2', '21':'DD2'}
 
 def usage():
     print "usage:sbeOpDistribute.py [--sbe_binary_dir] <sbe binary path> [--img_dir] <images path>"