modify defines according to _ASM_POWERPC_ISERIES_

Signed-off-by: Kelly Daly <kelly@au.ibm.com>
diff --git a/include/asm-powerpc/iseries/hv_call_event.h b/include/asm-powerpc/iseries/hv_call_event.h
index c2770b0..46763a3 100644
--- a/include/asm-powerpc/iseries/hv_call_event.h
+++ b/include/asm-powerpc/iseries/hv_call_event.h
@@ -20,8 +20,8 @@
  * This file contains the "hypervisor call" interface which is used to
  * drive the hypervisor from the OS.
  */
-#ifndef _HVCALLEVENT_H
-#define _HVCALLEVENT_H
+#ifndef _ASM_POWERPC_ISERIES_HV_CALL_EVENT_H
+#define _ASM_POWERPC_ISERIES_HV_CALL_EVENT_H
 
 #include <asm/iseries/hv_call_sc.h>
 #include <asm/iseries/hv_types.h>
@@ -250,4 +250,4 @@
 	return HvCall4(HvCallEventDmaToSp, abs_addr, remote, length, dir);
 }
 
-#endif /* _HVCALLEVENT_H */
+#endif /* _ASM_POWERPC_ISERIES_HV_CALL_EVENT_H */