bus: brcmstb_gisb: register the fault code hook

Commit 44127b77 ("bus: add Broadcom GISB bus arbiter timeout/error
handler") added everything that is required to register an ARM fault
handler for imprecise external aborts, except that there is nothing
calling this currently.

We do not need to export that specific function and have to update
arch/arm/mach-bcm/brcmstb.c to call it, simply, register the fault
handler during the probe() function of the driver.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

drivers/bus/brcmstb_gisb.c

@@ -160,12 +160,6 @@ static int brcmstb_bus_error_handler(unsigned long addr, unsigned int fsr,
 	return ret;
 }
 
-void __init brcmstb_hook_fault_code(void)
-{
-	hook_fault_code(22, brcmstb_bus_error_handler, SIGBUS, 0,
-			"imprecise external abort");
-}
-
 static irqreturn_t brcmstb_gisb_timeout_handler(int irq, void *dev_id)
 {
 	brcmstb_gisb_arb_decode_addr(dev_id, "timeout");
@@ -261,6 +255,9 @@ static int brcmstb_gisb_arb_probe(struct platform_device *pdev)
 
 	list_add_tail(&gdev->next, &brcmstb_gisb_arb_device_list);
 
+	hook_fault_code(22, brcmstb_bus_error_handler, SIGBUS, 0,
+			"imprecise external abort");
+
 	dev_info(&pdev->dev, "registered mem: %p, irqs: %d, %d\n",
 			gdev->base, timeout_irq, tea_irq);