Two bug fixes for the previous state of the imx sparse irq changes.

* 'imx/sparse-irq' of git://git.linaro.org/people/shawnguo/linux-2.6:
  ARM: imx: select USE_OF
  ARM: imx: Fix build error due to missing irqs.h include
Signed-off-by: Arnd Bergmann <arnd@arndb.de>