include/linux/interrupt.h: add dummy irq_set_irq_wake() for "!GENERIC_HARDIRQS"

include/linux/interrupt.h: add dummy irq_set_irq_wake() for "!GENERIC_HARDIRQS"

Since irq_set_irq_wake() has already declared in header file, when
GENERIC_HARDIRQS enabled.

Recommend to define the dummy one for GENERIC_HARDIRQS disabled, and also
let the other related "static inline" functions are independent from
GENERIC_HARDIRQS.

So can avoid the compiling error below, and also let the code simpler
and clearer.

The related compiling error (ARCH=s390 allmodconfig):

  sound/soc/codecs/wm0010.c: In function \91wm0010_spi_probe\92:
  sound/soc/codecs/wm0010.c:976:2: error: implicit declaration of function \91irq_set_irq_wake\92 [-Werror=implicit-function-declaration]

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>