MIPS: INCA-IP: rename inca-swap-bytes host tool

The INCA-IP SoC belongs to the Lantiq XWAY SoC product portfolio.
For the upcoming support of other Lantiq SoC devices this tool should
not solely depend on the INCA-IP board.

Rename the tool to xway-swap-bytes and add an config option
to enable compilation optionally.

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@googlemail.com>
Acked-by: Thomas Langer <thomas.langer@lantiq.com>
Signed-off-by: Shinya Kuribayashi <skuribay@pobox.com>

tools/xway-swap-bytes.c

@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#ifndef BUFSIZ
+# define BUFSIZ 4096
+#endif
+
+#undef BUFSIZ
+# define BUFSIZ 64
+int main (void)
+{
+	short ibuff[BUFSIZ], obuff[BUFSIZ];
+	int rc, i, len;
+
+	while ((rc = read (0, ibuff, sizeof (ibuff))) > 0) {
+		memset (obuff, 0, sizeof (obuff));
+		for (i = 0; i < (rc + 1) / 2; i++) {
+			obuff[i] = ibuff[i ^ 1];
+		}
+
+		len = (rc + 1) & ~1;
+
+		if (write (1, obuff, len) != len) {
+			perror ("read error");
+			return (EXIT_FAILURE);
+		}
+
+		memset (ibuff, 0, sizeof (ibuff));
+	}
+
+	if (rc < 0) {
+		perror ("read error");
+		return (EXIT_FAILURE);
+	}
+	return (EXIT_SUCCESS);
+}