evl/poll: add (back) wrapper files to define oob_poll_wait

This reverts commit 7c81fc4f

.

Reinstate the dovetail/poll.h wrapper files we had to drop from the
mere Dovetail code.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>

arch/arm/include/dovetail/poll.h

+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _EVL_DOVETAIL_POLL_H
+#define _EVL_DOVETAIL_POLL_H
+
+#include <asm-generic/evl/poll.h>
+
+#endif /* !_EVL_DOVETAIL_POLL_H */

arch/arm64/include/dovetail/poll.h

+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _EVL_DOVETAIL_POLL_H
+#define _EVL_DOVETAIL_POLL_H
+
+#include <asm-generic/evl/poll.h>
+
+#endif /* !_EVL_DOVETAIL_POLL_H */

arch/x86/include/dovetail/poll.h

+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _EVL_DOVETAIL_POLL_H
+#define _EVL_DOVETAIL_POLL_H
+
+#include <asm-generic/evl/poll.h>
+
+#endif /* !_EVL_DOVETAIL_POLL_H */