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/entry.S b/arch/blackfin/mach-common/entry.S
index 5531f49..e22c0a5 100644
--- a/arch/blackfin/mach-common/entry.S
+++ b/arch/blackfin/mach-common/entry.S
@@ -922,8 +922,8 @@
 	GET_PDA(p0, r0); 	/* Fetch current PDA (can't migrate to other CPU here) */
 	r0 = [p0 + PDA_IRQFLAGS];
 #else
-	p0.l = _irq_flags;
-	p0.h = _irq_flags;
+	p0.l = _bfin_irq_flags;
+	p0.h = _bfin_irq_flags;
 	r0 = [p0];
 #endif
 	sti r0;