ENGR00139274-1 [MX6]Enable suspend/resume feature

Enable suspend/resume feature for MX6q

echo standby > /sys/power/state -> wait mode;
echo mem > /sys/power/state -> stop mode;

Currentlu only support debug uart as wakeup source;

Signed-off-by: Anson Huang <b20788@freescale.com>
diff --git a/arch/arm/mach-mx6/Kconfig b/arch/arm/mach-mx6/Kconfig
index 2654399..5619c7e 100644
--- a/arch/arm/mach-mx6/Kconfig
+++ b/arch/arm/mach-mx6/Kconfig
@@ -39,6 +39,7 @@
 	select IMX_HAVE_PLATFORM_IMX_OCOTP
 	select IMX_HAVE_PLATFORM_IMX2_WDT
 	select IMX_HAVE_PLATFORM_IMX_SNVS_RTC
+	select IMX_HAVE_PLATFORM_IMX_PM
 	help
 	  Include support for i.MX 6Quad SABRE Automotive Infotainment platform. This includes specific
 	  configurations for the board and its peripherals.