mpc85xx: xpedite550x: remove CONFIG_FDT_FIXUP_PCI_IRQ

This macro is defined, but not referenced by anyone.

I did not touch config_whitelist.txt - the CONFIG will be dropped
by the next re-sync.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/include/configs/xpedite550x.h b/include/configs/xpedite550x.h
index b433224..6c0981b 100644
--- a/include/configs/xpedite550x.h
+++ b/include/configs/xpedite550x.h
@@ -204,7 +204,6 @@
 #define CONFIG_LOADS_ECHO		1	/* echo on for serial download */
 #define CONFIG_SYS_LOADS_BAUD_CHANGE	1	/* allow baudrate change */
 
-#define CONFIG_FDT_FIXUP_PCI_IRQ	1
 
 /*
  * I2C