Finish key import implementation.

This is the last bit of GoogleKeymaster that remained incomplete (for
the v0.3 functionality).

Change-Id: I27be52ae032883c004b2df21f0c7b229af512922
diff --git a/key.cpp b/key.cpp
index 2424800..74cb508 100644
--- a/key.cpp
+++ b/key.cpp
@@ -105,7 +105,9 @@
     case EVP_PKEY_RSA:
         return RsaKey::ImportKey(key_description, pkey.get(), logger, error);
     case EVP_PKEY_DSA:
+        return DsaKey::ImportKey(key_description, pkey.get(), logger, error);
     case EVP_PKEY_EC:
+        return EcdsaKey::ImportKey(key_description, pkey.get(), logger, error);
     default:
         *error = KM_ERROR_UNSUPPORTED_ALGORITHM;
         return NULL;