ARM: imx: pico-imx8mq: Add support for Technexion Pico-iMX8MQ

Add initial support for Technexion Pico-iMX8MQ SoM on PicoPI carrier
board. Currently working is ethernet, serial, eMMC. DT is imported
from Linux 5.4.28 ("462afcd6e7ea") .

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: "NXP i.MX U-Boot Team" <uboot-imx@nxp.com>
Cc: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Stefano Babic <sbabic@denx.de>
diff --git a/board/technexion/pico-imx8mq/lpddr4_timing.h b/board/technexion/pico-imx8mq/lpddr4_timing.h
new file mode 100644
index 0000000..89b0b92
--- /dev/null
+++ b/board/technexion/pico-imx8mq/lpddr4_timing.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2020 Marek Vasut <marek.vasut@gmail.com>
+ */
+
+#ifndef __LPDDR4_TIMING_H__
+#define __LPDDR4_TIMING_H__
+
+extern struct dram_timing_info dram_timing_1gb;
+extern struct dram_timing_info dram_timing_2gb;
+extern struct dram_timing_info dram_timing_3gb;
+extern struct dram_timing_info dram_timing_4gb;
+
+#endif /* __LPDDR4_TIMING_H__ */