asus-wmi: move WAPF variable into quirks_entry

Some models work better with different values of wapf, so move the
variable into quriks_entry to make it more easy to give a specific
value to different models.

Based on original patch from AceLan Kao <acelan.kao@canonical.com>

Cc: AceLan Kao <acelan.kao@canonical.com>
Signed-off-by: Corentin Chary <corentin.chary@gmail.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
diff --git a/drivers/platform/x86/asus-wmi.h b/drivers/platform/x86/asus-wmi.h
index 35003e4..d43b667 100644
--- a/drivers/platform/x86/asus-wmi.h
+++ b/drivers/platform/x86/asus-wmi.h
@@ -39,10 +39,10 @@
 	bool hotplug_wireless;
 	bool scalar_panel_brightness;
 	bool store_backlight_power;
+	int wapf;
 };
 
 struct asus_wmi_driver {
-	int			wapf;
 	int			brightness;
 	int			panel_power;