dmi: Mark all struct dmi_system_id instances const

... and __initconst if applicable.

Based on similar work for an older kernel in the Grsecurity patch.

[JD: fix toshiba-wmi build]
[JD: add htcpen]
[JD: move __initconst where checkscript wants it]

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jean Delvare <jdelvare@suse.de>
diff --git a/drivers/platform/x86/toshiba-wmi.c b/drivers/platform/x86/toshiba-wmi.c
index 4405286..03d7620 100644
--- a/drivers/platform/x86/toshiba-wmi.c
+++ b/drivers/platform/x86/toshiba-wmi.c
@@ -64,7 +64,7 @@ static void toshiba_wmi_notify(u32 value, void *context)
 	kfree(response.pointer);
 }
 
-static struct dmi_system_id toshiba_wmi_dmi_table[] __initdata = {
+static const struct dmi_system_id toshiba_wmi_dmi_table[] __initconst = {
 	{
 		.ident = "Toshiba laptop",
 		.matches = {