board: phytec: phycore_am64x: Add support for 1 GB RAM variant and ECC

Detect RAM size via EEPROM and adjust DDR size and banks accordingly.
Include necessary fixups to handle ECC-enabled configurations.

Signed-off-by: Wadim Egorov <w.egorov@phytec.de>
Tested-by: Daniel Schultz <d.schultz@phytec.de>
2 files changed