powerpc/64: Rename soft_enabled to irq_soft_mask

Rename the paca->soft_enabled to paca->irq_soft_mask as it is no
longer used as a flag for interrupt state, but a mask.

Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
diff --git a/arch/powerpc/kernel/idle_book3e.S b/arch/powerpc/kernel/idle_book3e.S
index 1bb1d15..2b26931 100644
--- a/arch/powerpc/kernel/idle_book3e.S
+++ b/arch/powerpc/kernel/idle_book3e.S
@@ -48,7 +48,7 @@
 	addi    r1,r1,128
 #endif
 	li	r0,IRQS_ENABLED
-	stb	r0,PACASOFTIRQEN(r13)
+	stb	r0,PACAIRQSOFTMASK(r13)
 	
 	/* Interrupts will make use return to LR, so get something we want
 	 * in there