uboot: revert "uboot: use local libfdt.h"

This reverts commit 3a6573ccee2624de0c604abf2c7df6704a4cf566.

It is no longer necessary after solving the problem differently.

Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

boot/uboot/uboot.mk

@@ -188,13 +188,6 @@ define UBOOT_APPLY_LOCAL_PATCHES
 endef
 UBOOT_POST_PATCH_HOOKS += UBOOT_APPLY_LOCAL_PATCHES
 
-# Bug: https://patchwork.ozlabs.org/patch/833760/
-define UBOOT_FIX_LIBFDT_SYSTEM_PATH
-	[ ! -e $(@D)/tools/fdtgrep.c ] || \
-	$(SED) 's%<../include/libfdt.h>%"../include/libfdt.h"%' $(@D)/tools/fdtgrep.c
-endef
-UBOOT_POST_PATCH_HOOKS += UBOOT_FIX_LIBFDT_SYSTEM_PATH
-
 ifeq ($(BR2_TARGET_UBOOT_BUILD_SYSTEM_LEGACY),y)
 define UBOOT_CONFIGURE_CMDS
 	$(TARGET_CONFIGURE_OPTS) 	\