Blackfin arch: rename irq_flags to bfin_irq_flags

rename irq_flags to bfin_irq_flags to avoid namespace
collision with common code

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

diff --git a/arch/blackfin/mach-common/smp.c b/arch/blackfin/mach-common/smp.c
index 7aeeced..66c47a7 100644
--- a/arch/blackfin/mach-common/smp.c
+++ b/arch/blackfin/mach-common/smp.c
@@ -365,7 +365,7 @@
 
 	/* Enable interrupt levels IVG7-15. IARs have been already
 	 * programmed by the boot CPU.  */
-	irq_flags |= IMASK_IVG15 |
+	bfin_irq_flags |= IMASK_IVG15 |
 	    IMASK_IVG14 | IMASK_IVG13 | IMASK_IVG12 | IMASK_IVG11 |
 	    IMASK_IVG10 | IMASK_IVG9 | IMASK_IVG8 | IMASK_IVG7 | IMASK_IVGHW;