freertos: release the generic version source code

freertos runs on the second core (small one) of the CPU

freertos/cvitek/common/include/cv1835/linux/semaphore.h

@@ -0,0 +1,21 @@
+#ifndef __SEMAPHORE_HEADER__
+#define __SEMAPHORE_HEADER__
+
+#include "linux/types.h"
+#include "FreeRTOS_POSIX.h"
+#include "FreeRTOS_POSIX/semaphore.h"
+
+#define semaphore sem_internal
+#define DEFINE_SEMAPHORE(name)  \
+    struct sem_internal name;
+
+void down(sem_internal_t *xsemaphore);
+void up(sem_internal_t *xsemaphore);
+int down_interruptible(sem_internal_t *sem);
+
+static inline void sema_init(sem_internal_t *sem, int val)
+{
+    sem_init(sem, NULL, val);
+}
+
+#endif