efee71ab4d
RAM init on mt7622 based bananapi R64 is broken since v2023.10.
Increasing the mem-map does not help here, so i reduced the maximum
available ram in get_ram_size call from 2G to 1G (board has only 1G).
Fixes: 5fd6d4c7b3 ("arm: mediatek: retrieve ram_base from dts node for armv8 platform")
Signed-off-by: Frank Wunderlich <frank-w@public-files.de>