kbuild: make gdb_script depend on prepare0 instead of prepare

'gdb_script' needs headers generated by ./Kbuild, which is visited
by 'prepare0'. None of 'gdb_script' depends on 'prepare'.

Loosen the dependency.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/Makefile b/Makefile
index 5d550ad..4bc9c70 100644
--- a/Makefile
+++ b/Makefile
@@ -1540,7 +1540,7 @@
 # ---------------------------------------------------------------------------
 
 PHONY += scripts_gdb
-scripts_gdb: prepare
+scripts_gdb: prepare0
 	$(Q)$(MAKE) $(build)=scripts/gdb
 	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)