Add 1GiB of DRAM at 0x2_0000_0000 to support the full 2GiB
of APE6EVM system memory also in case of DT reference.
Signed-off-by: NMagnus Damm <damm@opensource.se>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>