vt8500: Fix header in mach-vt8500/timer.c

Correct filename reference in file header.

Signed-off-by: Tony Prisk <linux@prisktech.co.nz>
diff --git a/arch/arm/mach-vt8500/timer.c b/arch/arm/mach-vt8500/timer.c
index 050e183..3dd21a4 100644
--- a/arch/arm/mach-vt8500/timer.c
+++ b/arch/arm/mach-vt8500/timer.c
@@ -1,5 +1,5 @@
 /*
- *  arch/arm/mach-vt8500/timer_dt.c
+ *  arch/arm/mach-vt8500/timer.c
  *
  *  Copyright (C) 2012 Tony Prisk <linux@prisktech.co.nz>
  *  Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>