feat(imx8mn): enable dram retention suuport on imx8mn

Enable dram retention support on i.MX8MN.

Signed-off-by: Jacky Bai <ping.bai@nxp.com>
Change-Id: I9b3a08efbbd154b2fc7e41bedb36a4d4e3784448
diff --git a/plat/imx/imx8m/imx8mn/imx8mn_bl31_setup.c b/plat/imx/imx8m/imx8mn/imx8mn_bl31_setup.c
index 8147792..5d2a64e 100644
--- a/plat/imx/imx8m/imx8mn/imx8mn_bl31_setup.c
+++ b/plat/imx/imx8m/imx8mn/imx8mn_bl31_setup.c
@@ -19,6 +19,7 @@
 #include <lib/xlat_tables/xlat_tables_v2.h>
 #include <plat/common/platform.h>
 
+#include <dram.h>
 #include <gpc.h>
 #include <imx_aipstz.h>
 #include <imx_uart.h>
@@ -207,6 +208,9 @@
 	/* select the CKIL source to 32K OSC */
 	mmio_write_32(IMX_ANAMIX_BASE + ANAMIX_MISC_CTL, 0x1);
 
+	/* Init the dram info */
+	dram_info_init(SAVED_DRAM_TIMING_BASE);
+
 	plat_gic_driver_init();
 	plat_gic_init();