[ARM] 5298/1: Drop desc_handle_irq()

desc_handle_irq() was declared as obsolete since long ago.
Replace it with generic_handle_irq()

Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-footbridge/isa-irq.c b/arch/arm/mach-footbridge/isa-irq.c
index 7132e52..d5a29a0 100644
--- a/arch/arm/mach-footbridge/isa-irq.c
+++ b/arch/arm/mach-footbridge/isa-irq.c
@@ -94,8 +94,7 @@
 		return;
 	}
 
-	desc = irq_desc + isa_irq;
-	desc_handle_irq(isa_irq, desc);
+	generic_handle_irq(isa_irq);
 }
 
 static struct irqaction irq_cascade = {