sh: define GENERIC_HARDIRQS_NO__DO_IRQ.

We haven't called in to __do_IRQ() in a long time, so it seems like a
reasonable time to switch this on by default.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 37b9101..1a4dc766 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -48,6 +48,9 @@
 config GENERIC_HARDIRQS
 	def_bool y
 
+config GENERIC_HARDIRQS_NO__DO_IRQ
+	def_bool y
+
 config GENERIC_IRQ_PROBE
 	def_bool y