Rename ssl_internal.h to ssl_misc.h

Signed-off-by: Chris Jones <christopher.jones@arm.com>
diff --git a/library/ssl_ticket.c b/library/ssl_ticket.c
index cd1ea7e..940e1a6 100644
--- a/library/ssl_ticket.c
+++ b/library/ssl_ticket.c
@@ -29,7 +29,7 @@
 #define mbedtls_free      free
 #endif
 
-#include "ssl_internal.h"
+#include "ssl_misc.h"
 #include "mbedtls/ssl_ticket.h"
 #include "mbedtls/error.h"
 #include "mbedtls/platform_util.h"