core: ltc: tomcrypt_custom.h: OP-TEE thread support

This is a cherry-pick of commit 0d1e115 ("core: ltc: enable
thread-safety") and commit a189a57 ("ltc: mutex support, in case of
no mutex").

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

core/lib/libtomcrypt/src/headers/tomcrypt_custom.h

@@ -678,7 +678,18 @@
 #endif
 
 /* THREAD management */
-#ifdef LTC_PTHREAD
+#if defined(_CFG_CORE_LTC_OPTEE_THREAD)
+
+#include <kernel/mutex.h>
+
+#define LTC_MUTEX_GLOBAL(x)   struct mutex x = MUTEX_INITIALIZER;
+#define LTC_MUTEX_PROTO(x)    extern struct mutex x;
+#define LTC_MUTEX_TYPE(x)     struct mutex x;
+#define LTC_MUTEX_INIT(x)     mutex_init(x);
+#define LTC_MUTEX_LOCK(x)     mutex_lock(x);
+#define LTC_MUTEX_UNLOCK(x)   mutex_unlock(x);
+
+#elif defined(LTC_PTHREAD)
 
 #include <pthread.h>