powerpc/t208x: enable errata A006261, A006593, A006379

Enable errata A006261, A006593, A006379 for T208x.
Additionally enable CONFIG_CMD_ERRATA for T2080RDB.

Signed-off-by: Shengzhou Liu <Shengzhou.Liu@freescale.com>
diff --git a/include/configs/T208xRDB.h b/include/configs/T208xRDB.h
index 0be0a0f..5b26178 100644
--- a/include/configs/T208xRDB.h
+++ b/include/configs/T208xRDB.h
@@ -721,6 +721,7 @@
 
 #define CONFIG_CMD_DHCP
 #define CONFIG_CMD_ELF
+#define CONFIG_CMD_ERRATA
 #define CONFIG_CMD_MII
 #define CONFIG_CMD_I2C
 #define CONFIG_CMD_PING