powerpc/64: Add #defines for paca->soft_enabled flags

Two #defines IRQS_ENABLED and IRQS_DISABLED are added to be used when
updating paca->soft_enabled. Replace the hardcoded values used when
updating paca->soft_enabled with IRQ_(EN|DIS)ABLED #define. No logic
change.

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
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 48c21ac..1bb1d15 100644
--- a/arch/powerpc/kernel/idle_book3e.S
+++ b/arch/powerpc/kernel/idle_book3e.S
@@ -17,6 +17,7 @@
 #include <asm/processor.h>
 #include <asm/thread_info.h>
 #include <asm/epapr_hcalls.h>
+#include <asm/hw_irq.h>
 
 /* 64-bit version only for now */
 #ifdef CONFIG_PPC64
@@ -46,7 +47,7 @@
 	bl	trace_hardirqs_on
 	addi    r1,r1,128
 #endif
-	li	r0,1
+	li	r0,IRQS_ENABLED
 	stb	r0,PACASOFTIRQEN(r13)
 	
 	/* Interrupts will make use return to LR, so get something we want