wb_altera_ddr_wrapper: fix read_done CDC problems

Signed-off-by: Franck Jullien <franck.jullien@gmail.com>
systems: add Altera NEEK board

This patch adds supports for the Altera NEEK board.

The systems supports:
- UART,
- Ethernet,
- VGA/LCD controller,
- SD-CARD (SPI mode).

Signed-off-by: Franck Jullien <franck.jullien@gmail.com>