arm64: imx: Add support for imx8mp-beacon-kit

Beacon Embedded has an i.MX8M Plus development kit which consists
of a SOM + baseboard.  The SOM includes Bluetooth, WiFi, QSPI, eMMC,
and one Ethernet PHY. The baseboard includes audio, HDMI, USB-C Dual
Role port, USB Hub with five ports, a PCIe slot, and a second Ethernet
PHY.  The device trees are already queued for inclusion in Linux 6.3.

Signed-off-by: Adam Ford <aford173@gmail.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/doc/board/beacon/index.rst b/doc/board/beacon/index.rst
new file mode 100644
index 0000000..1fe1046
--- /dev/null
+++ b/doc/board/beacon/index.rst
@@ -0,0 +1,9 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+Beacon
+======
+
+.. toctree::
+   :maxdepth: 2
+
+   beacon-imx8mp