Test AD too long only when CCM_ALT not defined

Since the AD too long is a limitation on Mbed TLS,
HW accelerators may support this. Run the test for AD too long,
only if `MBEDTLS_CCM_ALT` is not defined.
Addresses comment in Mbed-TLS#1996.

Author: Ron Eldor

tests/suites/test_suite_ccm.data

@@ -36,6 +36,7 @@ CCM lengths #6 tag length not even
 ccm_lengths:5:10:5:7:MBEDTLS_ERR_CCM_BAD_INPUT
 
 CCM lenghts #7 AD too long (2^16 - 2^8 + 1)
+depends_on:!MBEDTLS_CCM_ALT
 ccm_lengths:5:10:65281:8:MBEDTLS_ERR_CCM_BAD_INPUT
 
 CCM lengths #8 msg too long for this IV length (2^16, q = 2)