arm: imx8m: add support for Compulab iot-gate-imx8 (imx8mm-cl-iot-gate)

Add initial support for Compulab iot-gate-imx8 board (imx8mm-cl-iot-gate).
The initial support includes:
 - MMC
 - eMMC
 - I2C
 - FEC
 - Serial console

Signed-off-by: Kirill Kapranov <kirill.kapranov@compulab.co.il>
Signed-off-by: Uri Mashiach <uri.mashiach@compulab.co.il>
Signed-off-by: Valentin Raevsky <valentin@compulab.co.il>
Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>
Cc: Peter Robinson <pbrobinson@gmail.com>
diff --git a/board/compulab/imx8mm-cl-iot-gate/Makefile b/board/compulab/imx8mm-cl-iot-gate/Makefile
new file mode 100644
index 0000000..3a2bfc4
--- /dev/null
+++ b/board/compulab/imx8mm-cl-iot-gate/Makefile
@@ -0,0 +1,13 @@
+#
+# Copyright 2018 NXP
+# Copyright 2020 Linaro
+#
+# SPDX-License-Identifier:      GPL-2.0+
+#
+
+obj-y += imx8mm-cl-iot-gate.o
+
+ifdef CONFIG_SPL_BUILD
+obj-y += spl.o
+obj-y += ddr/
+endif