Add 1GiB of DRAM at 0x2_0000_0000 to support the full 2GiB
of APE6EVM system memory.
Signed-off-by: NTakashi Yoshii <takasi-y@ops.dti.ne.jp>
Signed-off-by: NMagnus Damm <damm@opensource.se>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>