rename ticket_flags helper functions to generic ones

Ticket flags is quite generic and may make sense in the
future versions of TLS or even in TLS 1.2 with new
extensions. This change remane the ticket_flags helper
functions with more generic `mbedtls_ssl_session` prefix
instead of `mbedtls_ssl_tls13_session`.

Signed-off-by: Pengyu Lv <pengyu.lv@arm.com>
diff --git a/library/ssl_misc.h b/library/ssl_misc.h
index 57b1d6d..b3d9112 100644
--- a/library/ssl_misc.h
+++ b/library/ssl_misc.h
@@ -2720,20 +2720,20 @@
 #endif
 
 #if defined(MBEDTLS_SSL_PROTO_TLS1_3) && defined(MBEDTLS_SSL_SESSION_TICKETS)
-static inline uint8_t mbedtls_ssl_tls13_session_get_ticket_flags(
+static inline unsigned int mbedtls_ssl_session_get_ticket_flags(
     mbedtls_ssl_session *session, uint8_t flags)
 {
     return session->ticket_flags &
            (flags & MBEDTLS_SSL_TLS1_3_TICKET_FLAGS_MASK);
 }
 
-static inline void mbedtls_ssl_tls13_session_set_ticket_flags(
+static inline void mbedtls_ssl_session_set_ticket_flags(
     mbedtls_ssl_session *session, uint8_t flags)
 {
     session->ticket_flags |= (flags & MBEDTLS_SSL_TLS1_3_TICKET_FLAGS_MASK);
 }
 
-static inline void mbedtls_ssl_tls13_session_clear_ticket_flags(
+static inline void mbedtls_ssl_session_clear_ticket_flags(
     mbedtls_ssl_session *session, uint8_t flags)
 {
     session->ticket_flags &= ~(flags & MBEDTLS_SSL_TLS1_3_TICKET_FLAGS_MASK);