perf: Fix the top-level Makefile

I missed this during the perf rename in commit ddb10ee574a3 ("perf: Move
to dev-utils/perf")

Signed-off-by: Barret Rhoden <brho@cs.berkeley.edu>

Makefile

diff --git a/Makefile b/Makefile
index c35ce4d..cf34227 100644
--- a/Makefile
+++ b/Makefile
@@ -686,14 +686,14 @@
 	@$(call make_as_parent, -C tools/apps/busybox)
 	@$(call make_as_parent, -C tools/apps/ipconfig install)
 	@$(call make_as_parent, -C tools/dev-libs/elfutils install)
-	@$(call make_as_parent, -C tools/profile/perf install)
+	@$(call make_as_parent, -C tools/dev-util/perf install)
 
 PHONY += apps-clean
 apps-clean: $(app-dirs-clean)
 	@$(call make_as_parent, -C tools/apps/busybox clean)
 	@$(call make_as_parent, -C tools/apps/ipconfig clean)
 	@$(call make_as_parent, -C tools/dev-libs/elfutils clean)
-	@$(call make_as_parent, -C tools/profile/perf clean)
+	@$(call make_as_parent, -C tools/dev-util/perf clean)
 
 # Cross Compiler
 # =========================================================================