au1000: add au1500 reserved interrupt

in the conversion done in the commits

  95c4eb3ef4484ca85da5c98780d358cffd546b90
  9d360ab4a7568a8d177280f651a8a772ae52b9b9

  [MIPS] Alchemy: Renumber interrupts so irq_cpu can work.

one reserved interrupt on au1500 was missed. this broke the au1000 ethernet 
driver.

this patch against 2.6.25.4 makes it work again.

Signed-off-by: Bruno Randolf <redacted>

--- a/include/asm-mips/mach-au1x00/au1000.h	2008-05-15 17:00:12.000000000 
+0200
+++ b/include/asm-mips/mach-au1x00/au1000.h	2008-06-06 16:22:51.000000000 
+0200

@@ -623,6 +623,7 @@
 	AU1000_RTC_MATCH1_INT,
 	AU1000_RTC_MATCH2_INT,
 	AU1500_PCI_ERR_INT,
+	AU1500_RESERVED_INT,
 	AU1000_USB_DEV_REQ_INT,
 	AU1000_USB_DEV_SUS_INT,
 	AU1000_USB_HOST_INT,