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/target-alpha/cpu.h b/target-alpha/cpu.h
index 6c5d28b..74bf7f7 100644
--- a/target-alpha/cpu.h
+++ b/target-alpha/cpu.h
@@ -276,7 +276,7 @@
     target_ulong t0, t1;
 #endif
 
-    /* Those resources are used only in Qemu core */
+    /* Those resources are used only in QEMU core */
     CPU_COMMON
 
     int error_code;