Backport 2.1: check if iv is zero in gcm.
1) found by roberto in mbedtls forum
2) if iv_len is zero, return an error
3) add tests for invalid parameters
diff --git a/tests/suites/test_suite_gcm.aes128_en.data b/tests/suites/test_suite_gcm.aes128_en.data
index d8bee9d..9453ffa 100644
--- a/tests/suites/test_suite_gcm.aes128_en.data
+++ b/tests/suites/test_suite_gcm.aes128_en.data
@@ -670,6 +670,10 @@
depends_on:MBEDTLS_AES_C
gcm_encrypt_and_tag:MBEDTLS_CIPHER_ID_AES:"fe481476fce76efcfc78ed144b0756f1":"246e1f2babab8da98b17cc928bd49504d7d87ea2cc174f9ffb7dbafe5969ff824a0bcb52f35441d22f3edcd10fab0ec04c0bde5abd3624ca25cbb4541b5d62a3deb52c00b75d68aaf0504d51f95b8dcbebdd8433f4966c584ac7f8c19407ca927a79fa4ead2688c4a7baafb4c31ef83c05e8848ec2b4f657aab84c109c91c277":"1a2c18c6bf13b3b2785610c71ccd98ca":"b0ab3cb5256575774b8242b89badfbe0dfdfd04f5dd75a8e5f218b28d3f6bc085a013defa5f5b15dfb46132db58ed7a9ddb812d28ee2f962796ad988561a381c02d1cf37dca5fd33e081d61cc7b3ab0b477947524a4ca4cb48c36f48b302c440be6f5777518a60585a8a16cea510dbfc5580b0daac49a2b1242ff55e91a8eae8":"5587620bbb77f70afdf3cdb7ae390edd0473286d86d3f862ad70902d90ff1d315947c959f016257a8fe1f52cc22a54f21de8cb60b74808ac7b22ea7a15945371e18b77c9571aad631aa080c60c1e472019fa85625fc80ed32a51d05e397a8987c8fece197a566689d24d05361b6f3a75616c89db6123bf5902960b21a18bc03a":32:"bd4265a8":0
+AES-GCM Bad IV (AES-128,128,0,0,32) #0
+depends_on:MBEDTLS_AES_C
+gcm_bad_parameters:MBEDTLS_CIPHER_ID_AES:MBEDTLS_GCM_ENCRYPT:"d0194b6ee68f0ed8adc4b22ed15dbf14":"":"":"":32:MBEDTLS_ERR_GCM_BAD_INPUT
+
AES-GCM Selftest
depends_on:MBEDTLS_AES_C
gcm_selftest: