Replacement for MBEDTLS_CIPHER_BLKSIZE_MAX

Prepare to rename this constant by MBEDTLS_CMAC_MAX_BLOCK_SIZE. The old name
was misleading since it looked like it covered all cipher support, not just
CMAC support, but CMAC doesn't support Camellia or ARIA so the two are
different.

This commit introduces the new constant. Subsequent commits will replace
internal uses of MBEDTLS_CIPHER_BLKSIZE_MAX and deprecate it.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/tests/suites/test_suite_cmac.function b/tests/suites/test_suite_cmac.function
index 4597550..71b5f00 100644
--- a/tests/suites/test_suite_cmac.function
+++ b/tests/suites/test_suite_cmac.function
@@ -113,6 +113,8 @@
                 != NULL);
     TEST_LE_U(mbedtls_cipher_info_get_block_size(cipher_info),
               MBEDTLS_CIPHER_BLKSIZE_MAX);
+    TEST_LE_U(mbedtls_cipher_info_get_block_size(cipher_info),
+              MBEDTLS_CMAC_MAX_BLOCK_SIZE);
 
     memset(buf, 0x2A, sizeof(buf));
     TEST_ASSERT((result == mbedtls_cipher_cmac(cipher_info, key, key_size,