mpc85xx/t104xrdb: convert deep sleep to generic board interface

A new interface is introduced to support generic board structure.
Converts it to use new interface.

Signed-off-by: Tang Yuantian <Yuantian.Tang@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
diff --git a/include/configs/T104xRDB.h b/include/configs/T104xRDB.h
index a54e0eb..57cdf72 100644
--- a/include/configs/T104xRDB.h
+++ b/include/configs/T104xRDB.h
@@ -104,7 +104,10 @@
 
 /* support deep sleep */
 #define CONFIG_DEEP_SLEEP
+#if defined(CONFIG_DEEP_SLEEP)
+#define CONFIG_BOARD_EARLY_INIT_F
 #define CONFIG_SILENT_CONSOLE
+#endif
 
 #ifndef CONFIG_SYS_TEXT_BASE
 #define CONFIG_SYS_TEXT_BASE	0xeff40000