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/arch/arm/mach-mvebu/Kconfig b/arch/arm/mach-mvebu/Kconfig
index 8ce0c9e..0fd71a7 100644
--- a/arch/arm/mach-mvebu/Kconfig
+++ b/arch/arm/mach-mvebu/Kconfig
@@ -41,6 +41,10 @@
 	bool "Support DB-88F6820-GP"
 	select 88F6820
 
+config TARGET_DB_88F6820_AMC
+	bool "Support DB-88F6820-AMC"
+	select 88F6820
+
 config TARGET_DB_MV784MP_GP
 	bool "Support db-mv784mp-gp"
 	select MV78460
@@ -63,6 +67,7 @@
 	default "clearfog" if TARGET_CLEARFOG
 	default "db-88f6720" if TARGET_DB_88F6720
 	default "db-88f6820-gp" if TARGET_DB_88F6820_GP
+	default "db-88f6820-amc" if TARGET_DB_88F6820_AMC
 	default "db-mv784mp-gp" if TARGET_DB_MV784MP_GP
 	default "ds414" if TARGET_DS414
 	default "maxbcm" if TARGET_MAXBCM
@@ -72,6 +77,7 @@
 	default "clearfog" if TARGET_CLEARFOG
 	default "db-88f6720" if TARGET_DB_88F6720
 	default "db-88f6820-gp" if TARGET_DB_88F6820_GP
+	default "db-88f6820-amc" if TARGET_DB_88F6820_AMC
 	default "db-mv784mp-gp" if TARGET_DB_MV784MP_GP
 	default "ds414" if TARGET_DS414
 	default "maxbcm" if TARGET_MAXBCM
@@ -81,6 +87,7 @@
 	default "Marvell" if TARGET_DB_MV784MP_GP
 	default "Marvell" if TARGET_DB_88F6720
 	default "Marvell" if TARGET_DB_88F6820_GP
+	default "Marvell" if TARGET_DB_88F6820_AMC
 	default "solidrun" if TARGET_CLEARFOG
 	default "Synology" if TARGET_DS414