powerpc/boot: Add byteswapping routines in oflib

Values will need to be byte-swapped when calling prom (big endian) from
a little endian boot wrapper.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/boot/ofconsole.c b/arch/powerpc/boot/ofconsole.c
index ce0e024..8b75470 100644
--- a/arch/powerpc/boot/ofconsole.c
+++ b/arch/powerpc/boot/ofconsole.c
@@ -18,7 +18,7 @@
 
 #include "of.h"
 
-static void *of_stdout_handle;
+static unsigned int of_stdout_handle;
 
 static int of_console_open(void)
 {
@@ -27,8 +27,10 @@
 	if (((devp = of_finddevice("/chosen")) != NULL)
 	    && (of_getprop(devp, "stdout", &of_stdout_handle,
 			   sizeof(of_stdout_handle))
-		== sizeof(of_stdout_handle)))
+		== sizeof(of_stdout_handle))) {
+		of_stdout_handle = be32_to_cpu(of_stdout_handle);
 		return 0;
+	}
 
 	return -1;
 }