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.mpc7448hpc2 b/doc/README.mpc7448hpc2
index 8659e83..cbb043e 100644
--- a/doc/README.mpc7448hpc2
+++ b/doc/README.mpc7448hpc2
@@ -8,7 +8,7 @@
 the memory, disk drive and Ethernet port subsystems.
 
 MPC7448hpc2(Taiga) is designed to the micro-ATX chassis, allowing it to be
-used in 1U or 2U rack-mount chassis¡¯, as well as in standard ATX/Micro-ATX
+used in 1U or 2U rack-mount chassis¡¯, as well as in standard ATX/Micro-ATX
 chassis.
 
 Building U-Boot