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/cm-bf537u/Makefile b/board/cm-bf537u/Makefile
index 3812ba1..bad018a 100644
--- a/board/cm-bf537u/Makefile
+++ b/board/cm-bf537u/Makefile
@@ -29,7 +29,7 @@
 
 LIB	= $(obj)lib$(BOARD).a
 
-COBJS-y	:= $(BOARD).o flash.o gpio_cfi_flash.o
+COBJS-y	:= $(BOARD).o gpio_cfi_flash.o
 
 SRCS	:= $(SOBJS-y:.o=.S) $(COBJS-y:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS-y))