SD card, no panic impl

[n123xyz]

The system should not panic on startup if no SD card is present. Wrap in an option. This prevents a failed reset where the system resets and if no card is present then vital systems can not perform as needed due to the panic that happens.

[n123xyz]

Less important now that the board resets if a panic occurs, however still should be present so that radio operations can perform as normal since logging is a secondary priority.