Replace Qemu by QEMU in comments

The official spelling is QEMU.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Andreas Färber <afaerber@suse.de>
[blauwirbel@gmail.com: fixed comment style in hw/sun4m.c]
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/hw/ppce500_mpc8544ds.c b/hw/ppce500_mpc8544ds.c
index 5ee8cb3..f1dfbe1 100644
--- a/hw/ppce500_mpc8544ds.c
+++ b/hw/ppce500_mpc8544ds.c
@@ -1,5 +1,5 @@
 /*
- * Qemu PowerPC MPC8544DS board emualtion
+ * QEMU PowerPC MPC8544DS board emulation
  *
  * Copyright (C) 2009 Freescale Semiconductor, Inc. All rights reserved.
  *