Fix a bug that iSCSI UI can Not Change Authentication Type from None to CHAP.
Fix a bug that iSCSI UI can Not Change Authentication Type from None to CHAP.

Signed-off-by: Fu Siyuan <siyuan.fu@intel.com>
Reviewed-by: Dong, Eric <eric.dong@intel.com>
Reviewed-by: Dong, Guo <guo.dong@intel.com>



git-svn-id: 3158a46dfd52e07d1fda3e32e1ab2e353a00b20f@14918 6f19259b-4bc3-4df7-8a09-765794883524

MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2