[MIPS] IP27: startup_bridge_irq: connect interrupt.

shutdown_bridge_irq disconnects the irq so we need to connect the irq or
requesting the same irq a send time will fail. This used to make
things like ifconfig eth0 down; ifconfig eth0 up fail on IP27.

Signed-off-by: Ralf Baechle <[e-mail]>

arch/mips/sgi-ip27/ip27-irq.c

···
 
         bridge->b_wid_tflush;
 
+	intr_connect_level(cpu, swlevel);
+
         return 0;       /* Never anything pending.  */
 }