External memory encrypt and decrypt control register
| ENABLE_SPI_MANUAL_ENCRYPT | Set 1 to enable the SPI manual encrypt. |
| ENABLE_DOWNLOAD_DB_ENCRYPT | Set 1 to enable download DB encrypt. |
| ENABLE_DOWNLOAD_G0CB_DECRYPT | Set 1 to enable download G0CB decrypt |
| ENABLE_DOWNLOAD_MANUAL_ENCRYPT | Set 1 to enable download manual encrypt |