u-boot: drop patch, no longer required

packages/tools/u-boot/patches/rockchip/u-boot-0001-dont-build-libfdt.patch

@@ -1,47 +0,0 @@
-From 3f028d24ed02173fea0950c28b3192f44e40c2a9 Mon Sep 17 00:00:00 2001
-From: Jonas Karlman <jonas@kwiboo.se>
-Date: Sat, 2 Dec 2017 11:47:07 +0100
-Subject: [PATCH] dont build libfdt
-
----
- scripts/Makefile.spl | 2 +-
- scripts/dtc/Makefile | 2 +-
- tools/dtoc/fdt.py    | 2 +-
- 3 files changed, 3 insertions(+), 3 deletions(-)
-
-diff --git a/scripts/Makefile.spl b/scripts/Makefile.spl
-index e2f0741db6..9264103366 100644
---- a/scripts/Makefile.spl
-+++ b/scripts/Makefile.spl
-@@ -249,7 +249,7 @@ $(obj)/$(SPL_BIN)-pad.bin: $(obj)/$(SPL_BIN)
- $(obj)/$(SPL_BIN).dtb: dts/dt-spl.dtb FORCE
- 	$(call if_changed,copy)
- 
--pythonpath = PYTHONPATH=scripts/dtc/pylibfdt
-+pythonpath = python
- 
- quiet_cmd_dtocc = DTOC C  $@
- cmd_dtocc = $(pythonpath) $(srctree)/tools/dtoc/dtoc -d $(obj)/$(SPL_BIN).dtb -o $@ platdata
-diff --git a/scripts/dtc/Makefile b/scripts/dtc/Makefile
-index 90ef2db85c..077acd50d9 100644
---- a/scripts/dtc/Makefile
-+++ b/scripts/dtc/Makefile
-@@ -31,4 +31,4 @@ $(obj)/dtc-lexer.lex.o: $(obj)/dtc-parser.tab.h
- clean-files	:= dtc-lexer.lex.c dtc-parser.tab.c dtc-parser.tab.h
- 
- # Added for U-Boot
--subdir-$(CONFIG_PYLIBFDT) += pylibfdt
-+#subdir-$(CONFIG_PYLIBFDT) += pylibfdt
-diff --git a/tools/dtoc/fdt.py b/tools/dtoc/fdt.py
-index dbc338653b..04f3c5935c 100644
---- a/tools/dtoc/fdt.py
-+++ b/tools/dtoc/fdt.py
-@@ -10,7 +10,7 @@ import struct
- import sys
- 
- import fdt_util
--import libfdt
-+from pylibfdt import libfdt
- 
- # This deals with a device tree, presenting it as an assortment of Node and
- # Prop objects, representing nodes and properties, respectively. This file