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/drivers/usb/host/dwc3-sti-glue.c b/drivers/usb/host/dwc3-sti-glue.c
index 67b2561..ce9335e 100644
--- a/drivers/usb/host/dwc3-sti-glue.c
+++ b/drivers/usb/host/dwc3-sti-glue.c
@@ -12,7 +12,7 @@
 #include <dm.h>
 #include <errno.h>
 #include <fdtdec.h>
-#include <libfdt.h>
+#include <linux/libfdt.h>
 #include <dm/lists.h>
 #include <regmap.h>
 #include <reset-uclass.h>
diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c
index 30297b0..a2c6d5a 100644
--- a/drivers/usb/host/ehci-exynos.c
+++ b/drivers/usb/host/ehci-exynos.c
@@ -10,7 +10,7 @@
 #include <common.h>
 #include <dm.h>
 #include <fdtdec.h>
-#include <libfdt.h>
+#include <linux/libfdt.h>
 #include <malloc.h>
 #include <usb.h>
 #include <asm/arch/cpu.h>
diff --git a/drivers/usb/host/ehci-msm.c b/drivers/usb/host/ehci-msm.c
index f5320ca..ea008bb 100644
--- a/drivers/usb/host/ehci-msm.c
+++ b/drivers/usb/host/ehci-msm.c
@@ -12,7 +12,7 @@
 #include <dm.h>
 #include <errno.h>
 #include <fdtdec.h>
-#include <libfdt.h>
+#include <linux/libfdt.h>
 #include <usb.h>
 #include <usb/ehci-ci.h>
 #include <usb/ulpi.h>
diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c
index 1c72330..f317cf0 100644
--- a/drivers/usb/host/ehci-tegra.c
+++ b/drivers/usb/host/ehci-tegra.c
@@ -16,7 +16,7 @@
 #include <asm/arch-tegra/clk_rst.h>
 #include <usb.h>
 #include <usb/ulpi.h>
-#include <libfdt.h>
+#include <linux/libfdt.h>
 
 #include "ehci.h"
 
diff --git a/drivers/usb/host/ehci-vf.c b/drivers/usb/host/ehci-vf.c
index 5bb3763..3d63cfa 100644
--- a/drivers/usb/host/ehci-vf.c
+++ b/drivers/usb/host/ehci-vf.c
@@ -20,7 +20,7 @@
 #include <asm/mach-imx/iomux-v3.h>
 #include <asm/mach-imx/regs-usbphy.h>
 #include <usb/ehci-ci.h>
-#include <libfdt.h>
+#include <linux/libfdt.h>
 #include <fdtdec.h>
 
 #include "ehci.h"
diff --git a/drivers/usb/host/xhci-exynos5.c b/drivers/usb/host/xhci-exynos5.c
index bf72865..6f08d5d 100644
--- a/drivers/usb/host/xhci-exynos5.c
+++ b/drivers/usb/host/xhci-exynos5.c
@@ -16,7 +16,7 @@
 #include <common.h>
 #include <dm.h>
 #include <fdtdec.h>
-#include <libfdt.h>
+#include <linux/libfdt.h>
 #include <malloc.h>
 #include <usb.h>
 #include <watchdog.h>