[WATCHDOG] Blackfin on-chip watchdog driver

This patch implements the driver necessary use the Analog Devices
Blackfin processor's on-chip watchdog controller, supports
BF53[123]/BF53[467]/BF54[2489]/BF561.

Signed-off-by: Mike Frysinger <michael.frysinger@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

diff --git a/drivers/char/watchdog/Makefile b/drivers/char/watchdog/Makefile
index d76a6f4..6f2342e 100644
--- a/drivers/char/watchdog/Makefile
+++ b/drivers/char/watchdog/Makefile
@@ -40,6 +40,9 @@
 # AVR32 Architecture
 obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
 
+# Blackfin Architecture
+obj-$(CONFIG_BFIN_WDT) += bfin_wdt.o
+
 # X86 (i386 + ia64 + x86_64) Architecture
 obj-$(CONFIG_ACQUIRE_WDT) += acquirewdt.o
 obj-$(CONFIG_ADVANTECH_WDT) += advantechwdt.o