ddr: marvell: a38x: add support for twin-die combined memory device

commit 6285efb8a118940877522c4c07bd7c64569b4f5f upstream.

the twin-die combined memory device should be treatened as X8
device and not as X16 one

Signed-off-by: Moti Buskila <motib@marvell.com>
Reviewed-by: Kostya Porotchkin <kostap@marvell.com>
[ - the default value for twin_die_combined is set to NOT_COMBINED for
    all boards, as this was default behaviour prior this change ]
Signed-off-by: Marek BehĂșn <marek.behun@nic.cz>
Tested-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
diff --git a/board/Marvell/db-88f6820-amc/db-88f6820-amc.c b/board/Marvell/db-88f6820-amc/db-88f6820-amc.c
index 163a1b3..122c63d 100644
--- a/board/Marvell/db-88f6820-amc/db-88f6820-amc.c
+++ b/board/Marvell/db-88f6820-amc/db-88f6820-amc.c
@@ -73,6 +73,7 @@
 	    MV_DDR_TIM_DEFAULT} },	/* timing */
 	BUS_MASK_32BIT,			/* Busses mask */
 	MV_DDR_CFG_DEFAULT,		/* ddr configuration data source */
+	NOT_COMBINED,			/* ddr twin-die combined */
 	{ {0} },			/* raw spd data */
 	{0}				/* timing parameters */
 };