mpc85xx/t104x: Add deep sleep framework support

When T104x soc wakes up from deep sleep, control is passed to the
primary core that starts executing uboot. After re-initialized some
IP blocks, like DDRC, kernel will take responsibility to continue
to restore environment it leaves before.

Signed-off-by: Tang Yuantian <Yuantian.Tang@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>

include/fsl_ddr_sdram.h

@@ -406,6 +406,10 @@ static int __board_need_mem_reset(void)
 int board_need_mem_reset(void)
 	__attribute__((weak, alias("__board_need_mem_reset")));
 
+void __weak board_mem_sleep_setup(void)
+{
+}
+
 /*
  * The 85xx boards have a common prototype for fixed_sdram so put the
  * declaration here.