kconfig: remove unused members from struct symbol

dep and dep2 in struct symbol was unused - remove them.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Roman Zippel <zippel@linux-m68k.org>

scripts/kconfig/expr.h

@@ -77,7 +77,6 @@ struct symbol {
 	tristate visible;
 	int flags;
 	struct property *prop;
-	struct expr *dep, *dep2;
 	struct expr_value rev_dep;
 };