watchdog: Add support for Xilinx Microblaze watchdog

Watchdog can be used on Microblaze, PPC and Zynq hw designs.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Tom Rini <trini@ti.com>
diff --git a/arch/microblaze/lib/board.c b/arch/microblaze/lib/board.c
index a7c2f76..815fb5a 100644
--- a/arch/microblaze/lib/board.c
+++ b/arch/microblaze/lib/board.c
@@ -61,6 +61,9 @@
 	serial_init,
 	console_init_f,
 	interrupts_init,
+#ifdef CONFIG_XILINX_TB_WATCHDOG
+	hw_watchdog_init,
+#endif
 	timer_init,
 	NULL,
 };