Convert ISO-8859 files to UTF-8

There was a mix of UTF-8 and ISO-8859 files in the U-Boot source
tree, which could cause issues with the patchwork review system.
This commit converts all ISO-8859 files to UTF-8.

Signed-off-by: Albert ARIBAUD <albert.u.boot@aribaud.net>
diff --git a/doc/README.RPXClassic b/doc/README.RPXClassic
index 5344cc6..e03f670 100644
--- a/doc/README.RPXClassic
+++ b/doc/README.RPXClassic
@@ -1,7 +1,7 @@
 # Porting U-Boot onto RPXClassic LF_BW31 board
 # Written by Pierre AUBERT
 # E-Mail  p.aubert@staubli.com
-# Stäubli Faverges - <www.staubli.com>
+# Stäubli Faverges - <www.staubli.com>
 #
 # Sept. 20 2001
 #