entropy_modulewrapper: set batch mode.

I figured that that this modulewrapper didn't need to bother exercising
batch mode but the shared code implements buffering and so it has to
advertise batch support so that acvptool will send flush commands.

Change-Id: I5fdd973332b70692c7c0a0768994ee5708dc2aa0
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/82447
Reviewed-by: David Benjamin <davidben@google.com>
Auto-Submit: Adam Langley <agl@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
diff --git a/util/fipstools/acvp/entropy_modulewrapper/modulewrapper.cc b/util/fipstools/acvp/entropy_modulewrapper/modulewrapper.cc
index 16c8892..523db6b 100644
--- a/util/fipstools/acvp/entropy_modulewrapper/modulewrapper.cc
+++ b/util/fipstools/acvp/entropy_modulewrapper/modulewrapper.cc
@@ -31,6 +31,10 @@
   static constexpr char kConfig[] =
       R"([
       {
+        "algorithm": "acvptool",
+        "features": ["batch"]
+      },
+      {
         "algorithm": "SHA2-384",
         "revision": "1.0",
         "messageLength": [{