adm5120: remove a superfluous patch

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

target/linux/adm5120/patches-3.7/201-amba_bus_hacks.patch

@@ -1,13 +0,0 @@
---- a/drivers/amba/bus.c
-+++ b/drivers/amba/bus.c
-@@ -20,6 +20,10 @@
- 
- #include <asm/irq.h>
- 
-+#ifndef NO_IRQ
-+#define NO_IRQ		(-1)
-+#endif
-+
- #define to_amba_driver(d)	container_of(d, struct amba_driver, drv)
- 
- static const struct amba_id *