kbuild: ia64: use $(src)/Makefile.gate rather than particular path

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>
diff --git a/arch/ia64/kernel/Makefile b/arch/ia64/kernel/Makefile
index 47e8aff..d68b5cf 100644
--- a/arch/ia64/kernel/Makefile
+++ b/arch/ia64/kernel/Makefile
@@ -51,7 +51,7 @@
 CFLAGS_traps.o  += -mfixed-range=f2-f5,f16-f31
 
 # The gate DSO image is built using a special linker script.
-include arch/ia64/kernel/Makefile.gate
+include $(src)/Makefile.gate
 # tell compiled for native
 CPPFLAGS_gate.lds += -D__IA64_GATE_PARAVIRTUALIZED_NATIVE