asus-nb-wmi: Constify asus_quirks[] DMI table

Constify the asus_quirks[] DMI table. There's no need to have it
writeable during runtime.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Corentin Chary <corentin.chary@gmail.com>
Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
diff --git a/drivers/platform/x86/asus-nb-wmi.c b/drivers/platform/x86/asus-nb-wmi.c
index c5da5b7..f3af203 100644
--- a/drivers/platform/x86/asus-nb-wmi.c
+++ b/drivers/platform/x86/asus-nb-wmi.c
@@ -84,7 +84,7 @@
 	return 1;
 }
 
-static struct dmi_system_id asus_quirks[] = {
+static const struct dmi_system_id asus_quirks[] = {
 	{
 		.callback = dmi_matched,
 		.ident = "ASUSTeK COMPUTER INC. X401U",