X86, Acer, WMI: Do not double include linux/dmi.h in acer-wmi.c

Including linux/dmi.h once in drivers/platform/x86/acer-wmi.c is enough.
Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Reviewed-by: Lee, Chun-Yi <jlee@novell.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/platform/x86/acer-wmi.c

@@ -39,7 +39,6 @@
 #include <linux/slab.h>
 #include <linux/input.h>
 #include <linux/input/sparse-keymap.h>
-#include <linux/dmi.h>
 
 #include <acpi/acpi_drivers.h>