imx8m_evk: Remove unneeded earlycon string

Passing earlycon string in the command line may be
useful during bring up, but not after such phase.

Remove the earlycon string to align with the other i.MX SoCs
command lines.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
diff --git a/include/configs/imx8mm_evk.h b/include/configs/imx8mm_evk.h
index acbab05..991fe00 100644
--- a/include/configs/imx8mm_evk.h
+++ b/include/configs/imx8mm_evk.h
@@ -39,7 +39,7 @@
 #define CONFIG_EXTRA_ENV_SETTINGS		\
 	"script=boot.scr\0" \
 	"image=Image.itb\0" \
-	"console=ttymxc1,115200 earlycon=ec_imx6q,0x30890000,115200\0" \
+	"console=ttymxc1,115200\0" \
 	"fdt_addr=0x43000000\0"			\
 	"fdt_high=0xffffffffffffffff\0"		\
 	"boot_fit=try\0" \
diff --git a/include/configs/imx8mn_evk.h b/include/configs/imx8mn_evk.h
index 62037c7..ce73ca6 100644
--- a/include/configs/imx8mn_evk.h
+++ b/include/configs/imx8mn_evk.h
@@ -42,7 +42,7 @@
 #define CONFIG_EXTRA_ENV_SETTINGS		\
 	"script=boot.scr\0" \
 	"image=Image.itb\0" \
-	"console=ttymxc1,115200 earlycon=ec_imx6q,0x30890000,115200\0" \
+	"console=ttymxc1,115200\0" \
 	"fdt_addr=0x43000000\0"			\
 	"fdt_high=0xffffffffffffffff\0"		\
 	"boot_fit=try\0" \
diff --git a/include/configs/imx8mq_evk.h b/include/configs/imx8mq_evk.h
index b29989d..5d9ef70 100644
--- a/include/configs/imx8mq_evk.h
+++ b/include/configs/imx8mq_evk.h
@@ -103,7 +103,7 @@
 	CONFIG_MFG_ENV_SETTINGS \
 	"script=boot.scr\0" \
 	"image=Image\0" \
-	"console=ttymxc0,115200 earlycon=ec_imx6q,0x30860000,115200\0" \
+	"console=ttymxc0,115200\0" \
 	"fdt_addr=0x43000000\0"			\
 	"fdt_high=0xffffffffffffffff\0"		\
 	"boot_fdt=try\0" \