armv8: ls1043aqds: Add TFABOOT support

TFABOOT support includes:
 - ls1043aqds_tfa_defconfig to be loaded by trusted firmware
 - environment address and size changes for TFABOOT
 - define BOOTCOMMAND for TFABOOT

Signed-off-by: Pankit Garg <pankit.garg@nxp.com>
Signed-off-by: Vinitha V Pillai <vinitha.pillai@nxp.com>
Signed-off-by: Rajesh Bhagat <rajesh.bhagat@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
diff --git a/board/freescale/ls1043aqds/ddr.c b/board/freescale/ls1043aqds/ddr.c
index efc441a..d29a3ad 100644
--- a/board/freescale/ls1043aqds/ddr.c
+++ b/board/freescale/ls1043aqds/ddr.c
@@ -108,6 +108,16 @@
 #endif
 }
 
+#ifdef CONFIG_TFABOOT
+int fsl_initdram(void)
+{
+	gd->ram_size = tfa_get_dram_size();
+	if (!gd->ram_size)
+		gd->ram_size = fsl_ddr_sdram_size();
+
+	return 0;
+}
+#else
 int fsl_initdram(void)
 {
 	phys_size_t dram_size;
@@ -131,3 +141,4 @@
 
 	return 0;
 }
+#endif