ARM: dts: imx: Pick safe DRAM size on failure on Data Modul i.MX8M Mini/Plus eDM SBC

In case gpio_request_list_by_name_nodev() in board dmo_get_memcfg()
returns error code, pick a safe default DRAM configuration instead
of bailing out with some sort of hang() or panic(). The BIT(2)|BIT(0)
strap option is the lowest known option of 2 GiB , use that.

Signed-off-by: Marek Vasut <marex@denx.de>

board/data_modul/common/common.c

@@ -47,6 +47,9 @@ u8 dmo_get_memcfg(void)
 					      "dmo,ram-coding-gpios",
 					      gpio, ARRAY_SIZE(gpio),
 					      GPIOD_IS_IN);
+	if (ret < 0)
+		return BIT(2) | BIT(0);
+
 	for (i = 0; i < ret; i++)
 		memcfg |= !!dm_gpio_get_value(&(gpio[i])) << i;