u-boot: Add correct python paths instead of patching source

packages/tools/u-boot/package.mk

@@ -40,7 +40,7 @@ make_target() {
     [ -n "$ATF_PLATFORM" ] &&  cp -av $(get_build_dir atf)/bl31.bin .
     DEBUG=${PKG_DEBUG} CROSS_COMPILE="$TARGET_KERNEL_PREFIX" LDFLAGS="" ARCH=arm make mrproper
     DEBUG=${PKG_DEBUG} CROSS_COMPILE="$TARGET_KERNEL_PREFIX" LDFLAGS="" ARCH=arm make $($ROOT/$SCRIPTS/uboot_helper $PROJECT $DEVICE $UBOOT_SYSTEM config)
-    DEBUG=${PKG_DEBUG} CROSS_COMPILE="$TARGET_KERNEL_PREFIX" LDFLAGS="" ARCH=arm make HOSTCC="$HOST_CC" HOSTSTRIP="true"
+    DEBUG=${PKG_DEBUG} CROSS_COMPILE="$TARGET_KERNEL_PREFIX" LDFLAGS="" ARCH=arm _python_sysroot="$TOOLCHAIN" _python_prefix=/ _python_exec_prefix=/ make HOSTCC="$HOST_CC" HOSTLDFLAGS="-L$TOOLCHAIN/lib" HOSTSTRIP="true"
   fi
 }
 

packages/tools/u-boot/patches/2018.09/u-boot-0001-dont-build-libfdt.patch

@@ -1,25 +0,0 @@
-diff --git a/dts/Kconfig b/dts/Kconfig
-index 0cef225ba9..e4e3455d4c 100644
---- a/dts/Kconfig
-+++ b/dts/Kconfig
-@@ -13,7 +13,6 @@ config PYLIBFDT
- 
- config DTOC
- 	bool
--	select PYLIBFDT
- 
- config BINMAN
- 	bool
-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
- from libfdt import QUIET_NOTFOUND
- 
- # This deals with a device tree, presenting it as an assortment of Node and