provide stubs for enable_irq_wake() and disable_irq_wake()

Provide {enable,disable}_irq_wakeup dummies for undefined
cross-compilers for platforms without CONFIG_GENERIC_IRQ.

Needed by wake-up-from-a-serial-port.patch

Signed-off-by: Guennadi Liakhovetski <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

include/linux/interrupt.h

···
 						enable_irq(irq)
 # endif
 
+static inline int enable_irq_wake(unsigned int irq)
+{
+	return 0;
+}
+
+static inline int disable_irq_wake(unsigned int irq)
+{
+	return 0;
+}
 #endif /* CONFIG_GENERIC_HARDIRQS */
 
 #ifndef __ARCH_SET_SOFTIRQ_PENDING