[DPP] Add "Not supported" failure code for DPP.

Add "Not supported" failure code for DPP.

Bug: 122851551
Test: atest DppManagerTest
Test: act.py -c ../WifiDppConfig.json -tc WifiDppTest
Change-Id: I3b0e9b0726387696c476b35f7e83ea9f0a921432
1 file changed