Rework is_metadata_wrappedkey_is_supported

Change-Id: Ia3c266bb32e31354375b633c4801e486f664539a
diff --git a/crypto/fscrypt/FsCrypt.cpp b/crypto/fscrypt/FsCrypt.cpp
index e967339..d676fae 100755
--- a/crypto/fscrypt/FsCrypt.cpp
+++ b/crypto/fscrypt/FsCrypt.cpp
@@ -230,7 +230,7 @@
     return false;
 }
 
-bool is_metadata_wrapped_key_supported() {
+bool is_metadata_wrapped_key_supported_common(const std::string& mount_point) {
 	LOG(DEBUG) << "Determining metadata wrapped-key support for " << mount_point;
 	std::string wrapped_key_supported = android::base::GetProperty("fbe.metadata.wrappedkey", "false");
 	LOG(DEBUG) << "fbe.metadata.wrappedkey = " << wrapped_key_supported;
@@ -242,6 +242,10 @@
     }
 }
 
+bool is_metadata_wrapped_key_supported() {
+	return is_metadata_wrapped_key_supported_common(METADATA_MNT_POINT);
+}
+
 static bool read_and_install_user_ce_key(userid_t user_id,
                                          const android::vold::KeyAuthentication& auth) {
     if (s_ce_key_raw_refs.count(user_id) != 0) return true;