add W520 invert value

thanks arch!
https://aur.archlinux.org/cgit/aur.git/tree/hdaps.conf?h=hdaps_lenovo-w520

Author: evgeni

hdaps.c

@@ -759,6 +759,7 @@ struct dmi_system_id __initdata hdaps_whitelist[] = {
 	HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T500", HDAPS_ORIENT_INVERT_XY),
 	HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T510", HDAPS_ORIENT_SWAP | HDAPS_ORIENT_INVERT_X | HDAPS_ORIENT_INVERT_Y),
 	HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad W510", HDAPS_ORIENT_MAX),
+	HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad W520", HDAPS_ORIENT_MAX),
 	HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X200s", HDAPS_ORIENT_SWAP | HDAPS_ORIENT_INVERT_XY),
 	HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X200", HDAPS_ORIENT_SWAP | HDAPS_ORIENT_INVERT_X | HDAPS_ORIENT_INVERT_Y),
 	HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X201 Tablet", HDAPS_ORIENT_SWAP | HDAPS_ORIENT_INVERT_XY),