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/board/RPXClassic/flash.c b/board/RPXClassic/flash.c
index f07d960..da7b42c 100644
--- a/board/RPXClassic/flash.c
+++ b/board/RPXClassic/flash.c
@@ -1,6 +1,6 @@
 /*
  * (C)  Copyright 2001
- * Stäubli Faverges - <www.staubli.com>
+ * Stäubli Faverges - <www.staubli.com>
  * Pierre AUBERT  p.aubert@staubli.com
  * U-Boot port on RPXClassic LF (CLLF_BW31) board
  *