Fix compilation issue weh self test defined
1. Surround the generate keys with
`#if ! defined(MBEDTLS_CMAC_ALT) || defined(MBEDTLS_SELF_TEST)`
to resolve build issue when `MBEDTLS_SELF_TEST` is defined for
alternative CMAC as well
2. Update ChangeLog
diff --git a/ChangeLog b/ChangeLog
index 13de867..5d43296 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,11 @@
mbed TLS ChangeLog (Sorted per branch, date)
+= mbed TLS x.x.x branch released xxxx-xx-xx
+
+Changes
+ * Add hardware acceleration support for cmac, with the configuration definition
+ of `MBEDTLS_CMAC_ALT`. Submitted by stevew817
+
= mbed TLS 2.4.2 branch released 2017-03-08
Security