board: emcraft: Add support for Emcraft Systems NavQ+

The Emcraft Systems NavQ+ kit is a mobile robotics platform
based on NXP i.MX8 MPlus SoC.

The following interfaces and devices are enabled:
- eMMC
- Gigabit Ethernet (through eQOS interface)
- SD-Card
- UART console

The device tree file is taken from upstream Linux Kernel
through OF_UPSTREAM

Signed-off-by: Gilles Talis <gilles.talis@gmail.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
diff --git a/doc/board/index.rst b/doc/board/index.rst
index 3fb7c84..ca5246e 100644
--- a/doc/board/index.rst
+++ b/doc/board/index.rst
@@ -24,6 +24,7 @@
    cloos/index
    congatec/index
    coreboot/index
+   emcraft/index
    emulation/index
    gateworks/index
    google/index