Blackfin: unify custom gpio commands

Now that we have a unified gpio layer, the misc partial gpio commands
can be unified and made complete (support all possible gpios).

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/board/bf537-stamp/Makefile b/board/bf537-stamp/Makefile
index 0e15062..4f8985b 100644
--- a/board/bf537-stamp/Makefile
+++ b/board/bf537-stamp/Makefile
@@ -29,7 +29,7 @@
 
 LIB	= $(obj)lib$(BOARD).a
 
-COBJS-y	:= $(BOARD).o cmd_bf537led.o
+COBJS-y	:= $(BOARD).o
 COBJS-$(CONFIG_BFIN_IDE)   += ide-cf.o
 COBJS-$(CONFIG_POST)       += post.o post-memory.o