tpmtest: update CBC mode to CFB too

To avoid failure on tpm implementation which only support CFB.
diff --git a/test/tpmtest/tpmtest.cpp b/test/tpmtest/tpmtest.cpp
index bf762e3..5aed25f 100644
--- a/test/tpmtest/tpmtest.cpp
+++ b/test/tpmtest/tpmtest.cpp
@@ -2569,7 +2569,7 @@
     inPublic.t.publicArea.authPolicy.t.size = 0;
     inPublic.t.publicArea.parameters.rsaDetail.symmetric.algorithm = TPM_ALG_AES;
     inPublic.t.publicArea.parameters.rsaDetail.symmetric.keyBits.aes = 128;
-    inPublic.t.publicArea.parameters.rsaDetail.symmetric.mode.aes = TPM_ALG_CBC;
+    inPublic.t.publicArea.parameters.rsaDetail.symmetric.mode.aes = TPM_ALG_CFB;
     inPublic.t.publicArea.parameters.rsaDetail.scheme.scheme = TPM_ALG_NULL;
     inPublic.t.publicArea.parameters.rsaDetail.keyBits = 2048;
     inPublic.t.publicArea.parameters.rsaDetail.exponent = 0;