mpc83xx: Update comment

Update the comment here to refer to PCI_CONFIG_ADDRESS rather than
CONFIG_ADDRESS.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/include/mpc83xx.h b/include/mpc83xx.h
index 71cffa1..0275b31 100644
--- a/include/mpc83xx.h
+++ b/include/mpc83xx.h
@@ -1372,7 +1372,7 @@
 #endif /* !CONFIG_MPC83XX_SDRAM */
 
 /*
- * CONFIG_ADDRESS - PCI Config Address Register
+ * PCI_CONFIG_ADDRESS - PCI Config Address Register
  */
 #define PCI_CONFIG_ADDRESS_EN		0x80000000
 #define PCI_CONFIG_ADDRESS_BN_SHIFT	16