mx28evk: Remove 'all' target from Makefile

Remove 'all' target from Makefile, as this is unused code.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Marek Vasut <marek.vasut@gmail.com>
diff --git a/board/freescale/mx28evk/Makefile b/board/freescale/mx28evk/Makefile
index 7459107..02ce108 100644
--- a/board/freescale/mx28evk/Makefile
+++ b/board/freescale/mx28evk/Makefile
@@ -37,8 +37,6 @@
 $(LIB):	$(obj).depend $(OBJS)
 	$(call cmd_link_o_target, $(OBJS))
 
-all:	$(ALL)
-
 #########################################################################
 
 # defines $(obj).depend target