Makefile: do not create a symbolic link to arch/${ARCH}/include/asm

In-tree build:
  - Do not create a symbolic link
      from include/asm to arch/${ARCH}/include/asm
  - Add ${SRCTREE}/arch/arm/include into the header search path

Out-of-tree build:
  - Do not create a directory ${OBJTREE}/include2
  - Do not create a symbolic link
      from ${OBJTREE}/include2/asm to ${SRCTREE}/arch/${ARCH}/include/asm
  - Add ${SRCTREE}/arch/arm/include into the header search path

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/tools/Makefile b/tools/Makefile
index ca76f94..14d94e3 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -160,7 +160,7 @@
 #
 HOSTCPPFLAGS =	-include $(SRCTREE)/include/libfdt_env.h \
 		-idirafter $(SRCTREE)/include \
-		-idirafter $(OBJTREE)/include2 \
+		-idirafter $(SRCTREE)/arch/$(ARCH)/include \
 		-idirafter $(OBJTREE)/include \
 		-I $(SRCTREE)/lib/libfdt \
 		-I $(SRCTREE)/tools \