About p54spi.

Look at board-n8x0.c, spi_board_info, wifi .modailias, it's a bit strange, but modalias different between board-n8x0.c and p54spi.c, p54spi_driver .name. Should be same.

I patch .name and get wifi working. Without this, p54spi.ko can't find device and dmesg output nothing.