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/arch/x86/cpu/resetvec.S b/arch/x86/cpu/resetvec.S
index c690d25..44aee5f 100644
--- a/arch/x86/cpu/resetvec.S
+++ b/arch/x86/cpu/resetvec.S
@@ -2,7 +2,7 @@
  *  U-boot - x86 Startup Code
  *
  * (C) Copyright 2002
- * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
+ * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
  *
  * See file CREDITS for list of people who contributed to this
  * project.