ARM: mvebu: set correct mem_size for db-88f6820-amc

The db-88f6820-amc has four chips with 2Gb density giving a total of 1GB
DRAM. Update the board_topology_map to reflect the correct
configuration.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>
1 file changed