util/inteltool: Makefile: add src/arch to includes.

Add src/arch to includes.

Change-Id: I157178a055a259e40c57f3915671d3b8966fbb96
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39525
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/util/inteltool/Makefile b/util/inteltool/Makefile
index b15ae8e..0a21c07 100644
--- a/util/inteltool/Makefile
+++ b/util/inteltool/Makefile
@@ -26,6 +26,7 @@
 LDFLAGS += -lpci -lz
 
 CPPFLAGS += -I$(top)/src/commonlib/include -I$(top)/src/commonlib/bsd/include
+CPPFLAGS += -I$(top)/src/arch/x86/include
 
 
 OBJS = inteltool.o pcr.o cpu.o gpio.o gpio_groups.o rootcmplx.o powermgt.o \