src/soc/intel/apollolake: include helpers.h in chip.h

include helpers.h in chip.h so that devicetree can use macros from helpers.h

Change-Id: Idfdee637a9b66a30be31b9ed113e1a44e4032f34
Signed-off-by: Pratik Prajapati <pratikkumar.v.prajapati@intel.com>
Reviewed-on: https://review.coreboot.org/22774
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/soc/intel/apollolake/chip.h

@@ -19,6 +19,7 @@
 #ifndef _SOC_APOLLOLAKE_CHIP_H_
 #define _SOC_APOLLOLAKE_CHIP_H_
 
+#include <commonlib/helpers.h>
 #include <soc/gpe.h>
 #include <soc/gpio.h>
 #include <intelblocks/lpc_lib.h>