selftests: ublk: add one dependency header

Add one dependency helper which can include new uapi definition which
isn't synced from kernel.

This way also helps a lot for downstream test deployment.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20250320013743.4167489-2-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: Ming Lei

tools/testing/selftests/ublk/kublk.h

@@ -21,6 +21,7 @@
 #include <sys/eventfd.h>
 #include <liburing.h>
 #include <linux/ublk_cmd.h>
+#include "ublk_dep.h"
 
 #define __maybe_unused __attribute__((unused))
 #define MAX_BACK_FILES   4

tools/testing/selftests/ublk/ublk_dep.h

@@ -0,0 +1,18 @@
+#ifndef UBLK_DEP_H
+#define UBLK_DEP_H
+
+#ifndef UBLK_U_IO_REGISTER_IO_BUF
+#define	UBLK_U_IO_REGISTER_IO_BUF	\
+	_IOWR('u', 0x23, struct ublksrv_io_cmd)
+#define	UBLK_U_IO_UNREGISTER_IO_BUF	\
+	_IOWR('u', 0x24, struct ublksrv_io_cmd)
+#endif
+
+#ifndef UBLK_F_USER_RECOVERY_FAIL_IO
+#define UBLK_F_USER_RECOVERY_FAIL_IO (1ULL << 9)
+#endif
+
+#ifndef UBLK_F_ZONED
+#define UBLK_F_ZONED (1ULL << 8)
+#endif
+#endif