Blackfin: add support for irqflags

This converts the irq handling in the Blackfin arch from the old irq.h /
system.h method to the new irqflags.h.  A stepping stone on the way to
other tracing functionality.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index 6ae9a03..d68cb0d 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -55,6 +55,9 @@
 config GENERIC_CALIBRATE_DELAY
 	def_bool y
 
+config TRACE_IRQFLAGS_SUPPORT
+	def_bool y
+
 source "init/Kconfig"
 
 source "kernel/Kconfig.preempt"