fix offsets of registers AIFSN, CWMIN and CWMAX (they differ from RT2661). add definition of STA_CSR5. remove definitions of register offsets that are unused or irrelevant.
fix offsets of registers AIFSN, CWMIN and CWMAX (they differ from RT2661).
add definition of STA_CSR5.
remove definitions of register offsets that are unused or irrelevant.

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars