Blackfin arch: punt CONFIG_BFIN -- we already have CONFIG_BLACKFIN

Signed-off-by: Mike Frysinger <michael.frysinger@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index ed438bc..d7e1996 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -600,7 +600,7 @@
 
 config SERIAL_BFIN
 	tristate "Blackfin serial port support"
-	depends on BFIN
+	depends on BLACKFIN
 	select SERIAL_CORE
 	select SERIAL_BFIN_UART0 if (BF531 || BF532 || BF533 || BF561)
 	help