Prepare for backports (compat-wireless) integration

- always use sagrad SPI in platform
- remove all production wireless code (CFG80211/MAC80211)
- but still use WEXT
Fix workaround for Pretec Tiger (CFM) series CompactFlash memory card (inc. time cicle for 60%)
Fix workaround for Pretec Tiger (CFM) series CompactFlash memory card (inc. time cicle twice)