ARM: imx: Set stdio to serial on Data Modul i.MX8M Mini/Plus eDM SBC

In case CONSOLE_MUX and SYS_CONSOLE_IS_IN_ENV are enabled, the console
stdin, stdout, stderr must be defined in environment. Define the default
settings to fix the following warning on boot:

"
In:    No input devices available!
Out:   No output devices available!
Err:   No error devices available!
"

Sort the default environment as well.

Signed-off-by: Marek Vasut <marex@denx.de>
diff --git a/include/configs/imx8mp_data_modul_edm_sbc.h b/include/configs/imx8mp_data_modul_edm_sbc.h
index 11ac3c0..8d79540 100644
--- a/include/configs/imx8mp_data_modul_edm_sbc.h
+++ b/include/configs/imx8mp_data_modul_edm_sbc.h
@@ -29,8 +29,6 @@
 	"bootlimit=3\0"							\
 	"devtype=mmc\0"							\
 	"devpart=1\0"							\
-	/* Give slow devices beyond USB HUB chance to come up. */	\
-	"usb_pgood_delay=2000\0"					\
 	"dmo_update_env="						\
 		"setenv dmo_update_env true ; saveenv ; saveenv\0"	\
 	"dmo_update_sf_write_data="					\
@@ -40,6 +38,11 @@
 		"run dmo_update_sf_write_data\0"			\
 	"dmo_update_sd_to_sf="						\
 		"load mmc 1:1 ${loadaddr} boot/flash.bin && "		\
-		"run dmo_update_sf_write_data\0"
+		"run dmo_update_sf_write_data\0"			\
+	"stdin=serial\0"						\
+	"stdout=serial\0"						\
+	"stderr=serial\0"						\
+	/* Give slow devices beyond USB HUB chance to come up. */	\
+	"usb_pgood_delay=2000\0"
 
 #endif