[U-Boot] fix makefiles to respect DTC setting

[Pavel Machek]

Top-level Makefile has option to select dtc binary, but it is ignored
due to bug in Makefile.lib. Fix it.

Signed-off-by: Pavel Machek <pavel at denx.de>

diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 13af604..8731fc6 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -275,7 +275,7 @@ $(obj)/%.dtb.S: $(obj)/%.dtb
 quiet_cmd_dtc = DTC     $@
 # Modified for U-Boot
 cmd_dtc = $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
-	dtc -O dtb -o $@ -b 0 \
+	$(DTC) -O dtb -o $@ -b 0 \
 		-i $(dir $<) $(DTC_FLAGS) \
 		-d $(depfile).dtc.tmp $(dtc-tmp) ; \
 	cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)

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