powerpc/virtex: Use generic xilinx irqchip driver

The Xilinx interrupt controller driver is now available in drivers/irqchip.
Switch to using that driver.

Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

arch/powerpc/include/asm/xilinx_intc.h

@@ -14,7 +14,7 @@
 #ifdef __KERNEL__
 
 extern void __init xilinx_intc_init_tree(void);
-extern unsigned int xilinx_intc_get_irq(void);
+extern unsigned int xintc_get_irq(void);
 
 #endif /* __KERNEL__ */
 #endif /* _ASM_POWERPC_XILINX_INTC_H */