ml507: fix out of tree build problem

Signed-off-by: Wolfgang Denk <wd@denx.de>

Makefile

@@ -1358,13 +1358,13 @@ ml300_config:	unconfig
 
 ml507_flash_config:	unconfig
 	@mkdir -p $(obj)include $(obj)board/xilinx/ml507
-	@cp $(obj)board/xilinx/ml507/u-boot-rom.lds  $(obj)board/xilinx/ml507/u-boot.lds
+	@cp board/xilinx/ml507/u-boot-rom.lds  $(obj)board/xilinx/ml507/u-boot.lds
 	@echo "TEXT_BASE = 0xFE360000" > $(obj)board/xilinx/ml507/config.tmp
 	@$(MKCONFIG) $(@:_flash_config=) ppc ppc4xx ml507 xilinx
 
 ml507_config:	unconfig
 	@mkdir -p $(obj)include $(obj)board/xilinx/ml507
-	@cp $(obj)board/xilinx/ml507/u-boot-ram.lds  $(obj)board/xilinx/ml507/u-boot.lds
+	@cp board/xilinx/ml507/u-boot-ram.lds  $(obj)board/xilinx/ml507/u-boot.lds
 	@$(MKCONFIG) $(@:_config=) ppc ppc4xx ml507 xilinx
 
 ocotea_config:	unconfig