freertos: release the generic version source code

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

freertos/cvitek/driver/sys/include/devmem.h

@@ -0,0 +1,12 @@
+#ifndef MODULES_COMMON_INCLUDE_DEVMEM_H_
+#define MODULES_COMMON_INCLUDE_DEVMEM_H_
+#include "xil_types.h"
+//#include <stdint.h>
+
+int devm_open(void);
+int devm_open_cached(void);
+void devm_close(int fd);
+void *devm_map(int fd, uint64_t addr, size_t len);
+void devm_unmap(void *virt_addr, size_t len);
+
+#endif // MODULES_COMMON_INCLUDE_DEVMEM_H_