dtc: Remove space from flex command line

Author: Geoff Levand <geoffrey.levand@am.sony.com>

Apparently some versions of flex don't correctly parse the -o
parameter, if there's a space between the -o and its argument.  So,
this patch removes it.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

Makefile

@@ -206,7 +206,7 @@ clean: libfdt_clean tests_clean
 
 %.lex.c: %.l
 	@$(VECHO) LEX $@
-	$(LEX) -o $@ $<
+	$(LEX) -o$@ $<
 
 %.tab.c %.tab.h %.output: %.y
 	@$(VECHO) BISON $@