powerpc: Convert to new irq_* function names

Scripted with coccinelle.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/powerpc/kernel/machine_kexec.c b/arch/powerpc/kernel/machine_kexec.c
index 2d65e9e..7ee50f0 100644
--- a/arch/powerpc/kernel/machine_kexec.c
+++ b/arch/powerpc/kernel/machine_kexec.c
@@ -31,7 +31,7 @@
 		if (!desc)
 			continue;
 
-		chip = get_irq_desc_chip(desc);
+		chip = irq_desc_get_chip(desc);
 		if (!chip)
 			continue;