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>
diff --git a/README b/README
index bbd7399..017a13d 100644
--- a/README
+++ b/README
@@ -431,6 +431,10 @@
 		This CONFIG is defined when the CPC is configured as SRAM at the
 		time of U-boot entry and is required to be re-initialized.
 
+		CONFIG_DEEP_SLEEP
+		Inidcates this SoC supports deep sleep feature. If deep sleep is
+		supported, core will start to execute uboot when wakes up.
+
 - Generic CPU options:
 		CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN