libfdt: move headers to <linux/libfdt.h> and <linux/libfdt_env.h>

Thomas reported U-Boot failed to build host tools if libfdt-devel
package is installed because tools include libfdt headers from
/usr/include/ instead of using internal ones.

This commit moves the header code:
  include/libfdt.h         -> include/linux/libfdt.h
  include/libfdt_env.h     -> include/linux/libfdt_env.h

and replaces include directives:
  #include <libfdt.h>      -> #include <linux/libfdt.h>
  #include <libfdt_env.h>  -> #include <linux/libfdt_env.h>

Reported-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index 6eea239..66e26fd 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -12,7 +12,7 @@
 #include <environment.h>
 #include <malloc.h>
 #include <asm/global_data.h>
-#include <libfdt_env.h>
+#include <linux/libfdt_env.h>
 #include <u-boot/crc.h>
 #include <bootm.h>
 #include <inttypes.h>
diff --git a/lib/efi_loader/efi_memory.c b/lib/efi_loader/efi_memory.c
index aaf6442..ff0edf3 100644
--- a/lib/efi_loader/efi_memory.c
+++ b/lib/efi_loader/efi_memory.c
@@ -10,7 +10,7 @@
 #include <efi_loader.h>
 #include <malloc.h>
 #include <asm/global_data.h>
-#include <libfdt_env.h>
+#include <linux/libfdt_env.h>
 #include <linux/list_sort.h>
 #include <inttypes.h>
 #include <watchdog.h>
diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index df9d9ae..320ee1d 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -11,7 +11,7 @@
 #include <errno.h>
 #include <fdtdec.h>
 #include <fdt_support.h>
-#include <libfdt.h>
+#include <linux/libfdt.h>
 #include <serial.h>
 #include <asm/sections.h>
 #include <linux/ctype.h>
diff --git a/lib/fdtdec_common.c b/lib/fdtdec_common.c
index 63b704a..2d08341 100644
--- a/lib/fdtdec_common.c
+++ b/lib/fdtdec_common.c
@@ -10,7 +10,7 @@
 
 #ifndef USE_HOSTCC
 #include <common.h>
-#include <libfdt.h>
+#include <linux/libfdt.h>
 #include <fdtdec.h>
 #else
 #include "libfdt.h"
diff --git a/lib/fdtdec_test.c b/lib/fdtdec_test.c
index cc8b918..c51ffd7 100644
--- a/lib/fdtdec_test.c
+++ b/lib/fdtdec_test.c
@@ -8,7 +8,7 @@
 
 #include <common.h>
 #include <fdtdec.h>
-#include <libfdt.h>
+#include <linux/libfdt.h>
 #include <malloc.h>
 #include <os.h>
 
diff --git a/lib/libfdt/Makefile b/lib/libfdt/Makefile
index 4e3e12f..edd8e64 100644
--- a/lib/libfdt/Makefile
+++ b/lib/libfdt/Makefile
@@ -23,3 +23,5 @@
 
 # U-Boot own file
 obj-y += fdt_region.o
+
+ccflags-y := -I$(srctree)/scripts/dtc/libfdt
diff --git a/lib/libfdt/fdt_region.c b/lib/libfdt/fdt_region.c
index 5bfc4da..70914a4 100644
--- a/lib/libfdt/fdt_region.c
+++ b/lib/libfdt/fdt_region.c
@@ -5,11 +5,11 @@
  * SPDX-License-Identifier:	GPL-2.0+ BSD-2-Clause
  */
 
-#include <libfdt_env.h>
+#include <linux/libfdt_env.h>
 
 #ifndef USE_HOSTCC
 #include <fdt.h>
-#include <libfdt.h>
+#include <linux/libfdt.h>
 #else
 #include "fdt_host.h"
 #endif
diff --git a/lib/libfdt/fdt_ro.c b/lib/libfdt/fdt_ro.c
index 1be9538..d972d03 100644
--- a/lib/libfdt/fdt_ro.c
+++ b/lib/libfdt/fdt_ro.c
@@ -3,11 +3,11 @@
  * Copyright (C) 2006 David Gibson, IBM Corporation.
  * SPDX-License-Identifier:	GPL-2.0+ BSD-2-Clause
  */
-#include <libfdt_env.h>
+#include <linux/libfdt_env.h>
 
 #ifndef USE_HOSTCC
 #include <fdt.h>
-#include <libfdt.h>
+#include <linux/libfdt.h>
 #else
 #include "fdt_host.h"
 #endif
diff --git a/lib/of_live.c b/lib/of_live.c
index f351483..148865c 100644
--- a/lib/of_live.c
+++ b/lib/of_live.c
@@ -10,7 +10,7 @@
  */
 
 #include <common.h>
-#include <libfdt.h>
+#include <linux/libfdt.h>
 #include <of_live.h>
 #include <malloc.h>
 #include <dm/of_access.h>