feat(st-crypto): add STM32 RNG driver

This driver manages the STM32 Random Number Generator
peripheral.

Change-Id: I4403ebb2dbdaa8df993a4413f1ef48eeba00427c
Signed-off-by: Yann Gautier <yann.gautier@st.com>
Signed-off-by: Lionel Debieve <lionel.debieve@foss.st.com>
diff --git a/include/drivers/st/stm32_rng.h b/include/drivers/st/stm32_rng.h
new file mode 100644
index 0000000..6ac064d
--- /dev/null
+++ b/include/drivers/st/stm32_rng.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2022, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef STM32_RNG_H
+#define STM32_RNG_H
+
+#include <stdint.h>
+
+int stm32_rng_read(uint8_t *out, uint32_t size);
+int stm32_rng_init(void);
+
+#endif /* STM32_RNG_H */