ARM: tegra: combine duplicate Makefile rules

The rules to generate u-boot-{no,}dtb-tegra.bin were almost identical.
Combine them into a single paremeterized rule. This will allow the next
patch to edit a single rule, rather than being cut/paste twice.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/Makefile b/Makefile
index d385467..216ad02 100644
--- a/Makefile
+++ b/Makefile
@@ -515,16 +515,17 @@
 
 ifeq ($(SOC),tegra20)
 ifeq ($(CONFIG_OF_SEPARATE),y)
-$(obj)u-boot-dtb-tegra.bin:	$(obj)spl/u-boot-spl.bin $(obj)u-boot.bin $(obj)u-boot.dtb
-		$(OBJCOPY) ${OBJCFLAGS} --pad-to=$(CONFIG_SYS_TEXT_BASE) -O binary $(obj)spl/u-boot-spl $(obj)spl/u-boot-spl-pad.bin
-		cat $(obj)spl/u-boot-spl-pad.bin $(obj)u-boot.bin $(obj)u-boot.dtb > $@
-		rm $(obj)spl/u-boot-spl-pad.bin
+nodtb=dtb
+dtbfile=$(obj)u-boot.dtb
 else
-$(obj)u-boot-nodtb-tegra.bin:	$(obj)spl/u-boot-spl.bin $(obj)u-boot.bin
-		$(OBJCOPY) ${OBJCFLAGS} --pad-to=$(CONFIG_SYS_TEXT_BASE) -O binary $(obj)spl/u-boot-spl $(obj)spl/u-boot-spl-pad.bin
-		cat $(obj)spl/u-boot-spl-pad.bin $(obj)u-boot.bin > $@
-		rm $(obj)spl/u-boot-spl-pad.bin
+nodtb=nodtb
+dtbfile=
 endif
+
+$(obj)u-boot-$(nodtb)-tegra.bin: $(obj)spl/u-boot-spl.bin $(obj)u-boot.bin $(dtbfile)
+		$(OBJCOPY) ${OBJCFLAGS} --pad-to=$(CONFIG_SYS_TEXT_BASE) -O binary $(obj)spl/u-boot-spl $(obj)spl/u-boot-spl-pad.bin
+		cat $(obj)spl/u-boot-spl-pad.bin $(obj)u-boot.bin $(dtbfile) > $@
+		rm $(obj)spl/u-boot-spl-pad.bin
 endif
 
 ifeq ($(CONFIG_SANDBOX),y)