rootfs:/etc/modules tweaks

1> add unifi_sdio
2> remove SATA and 8192cu
sunxi-boards:re-enable mmc0 sdcard
update-nand-contents.sh:update nand-contents fex

After copying the script.bin.lcd4.3, generate nand-contents/
script.lcd4.3.fex and diff with sunxi-boards version so that
they are identical.