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/arch/blackfin/cpu/Makefile b/arch/blackfin/cpu/Makefile
index 91797c7..b7f991d 100644
--- a/arch/blackfin/cpu/Makefile
+++ b/arch/blackfin/cpu/Makefile
@@ -18,6 +18,7 @@
 SEXTRA   := start.o
 SOBJS    := interrupt.o cache.o
 COBJS-$(CONFIG_BOOTCOUNT_LIMIT) += bootcount.o
+COBJS-$(CONFIG_CMD_GPIO) += cmd_gpio.o
 COBJS-y  += cpu.o
 COBJS-y  += gpio.o
 COBJS-y  += interrupts.o