[PCMCIA] Disable IRQ steering and don't change the IRQ MUX register.

The IRQ steering code operates too early at present, and actually
prevents us detecting ISA interrupts.

We should not touch the IRQ MUX register on TI bridges - only the
machine itself knows the right value for this.  The kernel doesn't
have the knowledge to know what function the cardbus controllers
multi-function pins have been assigned by the hardware manufacturer.

drivers/pcmcia/ti113x.h

@@ -258,6 +258,7 @@ static int ti_override(struct yenta_socket *socket)
 	if (new != reg)
 		exca_writeb(socket, I365_INTCTL, new);
 
+#if 0
 	/*
 	 * If ISA interrupts don't work, then fall back to routing card
 	 * interrupts to the PCI interrupt of the socket.
@@ -282,6 +283,7 @@ static int ti_override(struct yenta_socket *socket)
 			config_writeb(socket, TI113X_DEVICE_CONTROL, devctl);
 		}
 	}
+#endif
 
 	socket->socket.ops->init = ti_init;
 	return 0;
@@ -327,9 +329,11 @@ static int ti1250_init(struct pcmcia_socket *sock)
 	struct yenta_socket *socket = container_of(sock, struct yenta_socket, socket);
 	ti113x_init(sock);
 	ti_irqmux(socket) = config_readl(socket, TI122X_IRQMUX);
+#if 0
 	ti_irqmux(socket) = (ti_irqmux(socket) & ~0x0f) | 0x02; /* route INTA */
 	if (!(ti_sysctl(socket) & TI122X_SCR_INTRTIE))
 		ti_irqmux(socket) |= 0x20; /* route INTB */
+#endif
 	
 	config_writel(socket, TI122X_IRQMUX, ti_irqmux(socket));