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/drivers/video/sed13806.c b/drivers/video/sed13806.c
index 9cd19b5..0bf9ba6 100644
--- a/drivers/video/sed13806.c
+++ b/drivers/video/sed13806.c
@@ -1,6 +1,6 @@
 /*
  * (C) Copyright 2002
- * Stäubli Faverges - <www.staubli.com>
+ * Stäubli Faverges - <www.staubli.com>
  * Pierre AUBERT  p.aubert@staubli.com
  *
  * See file CREDITS for list of people who contributed to this