arm: mx5: Add M53Menlo board

Add Menlosystems M53 board, based on the M53 SoM.
This board has Ethernet, USB host, USB gadget, UART and LCD on it.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
diff --git a/board/menlo/m53menlo/MAINTAINERS b/board/menlo/m53menlo/MAINTAINERS
new file mode 100644
index 0000000..7b78340
--- /dev/null
+++ b/board/menlo/m53menlo/MAINTAINERS
@@ -0,0 +1,7 @@
+M53MENLO BOARD
+M:	Marek Vasut <marex@denx.de>
+M:	Olaf Mandel <o.mandel@menlosystems.com>
+S:	Maintained
+F:	board/menlo/m53menlo/
+F:	include/configs/m53menlo.h
+F:	configs/m53menlo_defconfig