Blackfin: convert to GENERIC_HARDIRQS_NO__DO_IRQ

Blackfin already sets proper flow handlers on all IRQs, and we don't rely
on __do_IRQ, therefore we can simply select GENERIC_HARDIRQS_NO__DO_IRQ.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index e519882..ae6a60f 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -47,6 +47,9 @@
 config GENERIC_IRQ_PROBE
 	def_bool y
 
+config GENERIC_HARDIRQS_NO__DO_IRQ
+	def_bool y
+
 config GENERIC_GPIO
 	def_bool y