bx50v3: Use imx_ddr_size() for calculating the DDR size

imx_ddr_size() can be used to calculate the DDR size in runtime.

By using this function we no longer need to define PHYS_SDRAM_SIZE.

Cc: Martin Donnelly <martin.donnelly@ge.com>
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>

board/ge/bx50v3/bx50v3.c

@@ -60,7 +60,7 @@ DECLARE_GLOBAL_DATA_PTR;
 
 int dram_init(void)
 {
-	gd->ram_size = get_ram_size((void *)PHYS_SDRAM, PHYS_SDRAM_SIZE);
+	gd->ram_size = imx_ddr_size();
 
 	return 0;
 }

include/configs/ge_bx50v3.h

@@ -32,8 +32,6 @@
 #define CONFIG_MXC_UART_BASE	UART3_BASE
 #define CONFIG_CONSOLE_DEV	"ttymxc2"
 
-#define PHYS_SDRAM_SIZE		(2u * 1024 * 1024 * 1024)
-
 #define CONFIG_SUPPORT_EMMC_BOOT