arm: zynq: Wire automatic ddr detection for Zynq and ZynqMP case

When static memory configuration is used U-Boot has capability to detect
memory size in setup range. Enable this feature for static
configuration.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/board/xilinx/zynq/board.c b/board/xilinx/zynq/board.c
index 838ac0f..2f4679e 100644
--- a/board/xilinx/zynq/board.c
+++ b/board/xilinx/zynq/board.c
@@ -184,7 +184,8 @@
 #else
 int dram_init(void)
 {
-	gd->ram_size = CONFIG_SYS_SDRAM_SIZE;
+	gd->ram_size = get_ram_size((void *)CONFIG_SYS_SDRAM_BASE,
+				    CONFIG_SYS_SDRAM_SIZE);
 
 	zynq_ddrc_init();