fsl_p2020rdbpca: configure additional TLV EEPROM parameters

Specify one additional EEPROM parameter required by the updated TLV
EEPROM code:

1. CONFIG_SYS_EEPROM_MAX_SIZE, which is the maximum size, in bytes, of
   the EEPROM data.  For this platform it is the NOR flash sector size.

Reviewed By: scotte

Testing Done: none