Test AES-GCM-SIV with OPENSSL_SMALL.

https://boringssl-review.googlesource.com/16805 inadvertently restored
the OPENSSL_SMALL condition in aead_test.cc. I probably handled some
merge conflict wrong.

Change-Id: I1b29fbd4a0a57d94cd8b5bddf7c81ae10063e2a8
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/35544
Reviewed-by: Adam Langley <agl@google.com>

crypto/cipher_extra/aead_test.cc

diff --git a/crypto/cipher_extra/aead_test.cc b/crypto/cipher_extra/aead_test.cc
index e3acce1..25d4a8e 100644
--- a/crypto/cipher_extra/aead_test.cc
+++ b/crypto/cipher_extra/aead_test.cc
@@ -55,12 +55,10 @@
      0},
     {"AES_256_GCM_NIST", EVP_aead_aes_256_gcm, "nist_cavp/aes_256_gcm.txt",
      false, true, 0},
-#if !defined(OPENSSL_SMALL)
     {"AES_128_GCM_SIV", EVP_aead_aes_128_gcm_siv, "aes_128_gcm_siv_tests.txt",
      false, false, 0},
     {"AES_256_GCM_SIV", EVP_aead_aes_256_gcm_siv, "aes_256_gcm_siv_tests.txt",
      false, false, 0},
-#endif
     {"ChaCha20Poly1305", EVP_aead_chacha20_poly1305,
      "chacha20_poly1305_tests.txt", false, true, 0},
     {"XChaCha20Poly1305", EVP_aead_xchacha20_poly1305,