sh: define GENERIC_LOCKBREAK.

Needed for fixing up the __raw_spin_is_contended() reference which
results in a build error.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 0ae5411..37b9101 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -63,6 +63,10 @@
 config GENERIC_CLOCKEVENTS
 	def_bool n
 
+config GENERIC_LOCKBREAK
+	def_bool y
+	depends on SMP && PREEMPT
+
 config SYS_SUPPORTS_PM
 	bool