The NO_IRQ symbol is not used by the amba core since
upstream commit:

  dfb85185bda373a70409c70c2632b02fb0f8f449
  AMBA: get rid of last two uses of NO_IRQ

  This gets rid of the last two users of NO_IRQ in AMBA primecell
  drivers.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 35748