Makefile: Quiesce libfdt build

Since commit 3809e302 "Makefile: honor PYTHON configuration properly",
the build commands of libfdt are printed while previously were not.

This adds the missing '--quiet' back.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/tools/Makefile b/tools/Makefile
index 086c533..5605fa7 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -138,7 +138,7 @@
 		CPPFLAGS="$(_hostc_flags)" OBJDIR=tools \
 		SOURCES="$(LIBFDT_SRCS) tools/libfdt.i" \
 		SWIG_OPTS="-I$(srctree)/lib/libfdt -I$(srctree)/lib" \
-		$(PYTHON) $(libfdt_tree)/pylibfdt/setup.py build_ext \
+		$(PYTHON) $(libfdt_tree)/pylibfdt/setup.py --quiet build_ext \
 			--build-lib tools
 
 ifneq ($(CONFIG_MX23)$(CONFIG_MX28),)