keystore: Add flag for blobs to be unencrypted

In order to let apps use keystore more productively, make the blob
encryption optional. As more hardware-assisted keystores (i.e., hardware
that has a Keymaster HAL) come around, encrypting blobs start to make
less sense since the thing it's encrypting is usually a token and not
any raw key material.

Bug: 8122243
Change-Id: I7d70122beb32b59f06a923ade93234393b75a2cd
diff --git a/keystore/keystore_cli.cpp b/keystore/keystore_cli.cpp
index fc501bf..1e19890 100644
--- a/keystore/keystore_cli.cpp
+++ b/keystore/keystore_cli.cpp
@@ -208,7 +208,7 @@
 
     NO_ARG_INT_RETURN(zero);
 
-    SINGLE_ARG_PLUS_UID_INT_RETURN(generate);
+    // TODO: generate
 
     SINGLE_ARG_DATA_RETURN(get_pubkey);