feature: Support pipe and poll interfaces.

支持pipe管道驱动，支持poll多文件描述符检测接口。

Signed-off-by: JerryH <huangjieliang@huawei.com>
Change-Id: Ida1f29709affbc91a26b8518e4a77b8e5469be19

kernel/src/los_init.c

@@ -74,6 +74,10 @@
 #include "los_lmk.h"
 #endif
 
+#if (LOSCFG_POSIX_PIPE_API == 1)
+#include "pipe_impl.h"
+#endif
+
 /*****************************************************************************
  Function    : LOS_Reboot
  Description : system exception, die in here, wait for watchdog.
@@ -238,6 +242,14 @@ LITE_OS_SEC_TEXT_INIT UINT32 LOS_KernelInit(VOID)
     }
 #endif
 
+#if (LOSCFG_POSIX_PIPE_API == 1)
+    ret = OsPipeInit();
+    if (ret != LOS_OK) {
+        PRINT_ERR("Pipe init failed!\n");
+        return ret;
+    }
+#endif
+
     return LOS_OK;
 }