arm: mvebu: add DB-88F6820-AMC board

This board is a plug in card for Marvell's switch system development
kits. Form-factor aside it is similar to the DB-88F6820-GP with the
following differences.
- TCLK is 200MHz
- SPI1 is used
- No SATA
- No MMC
- NAND flash

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Chris Packham <judge.packham@gmail.com>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/board/Marvell/db-88f6820-amc/MAINTAINERS b/board/Marvell/db-88f6820-amc/MAINTAINERS
new file mode 100644
index 0000000..abf5b7e
--- /dev/null
+++ b/board/Marvell/db-88f6820-amc/MAINTAINERS
@@ -0,0 +1,6 @@
+DB_88F6820_AMC BOARD
+M:	Chris Packham <chris.packham@alliedtelesis.co.nz>
+S:	Maintained
+F:	board/Marvell/db-88f6820-amc/
+F:	include/configs/db-88f6820-amc.h
+F:	configs/db-88f6820-amc_defconfig