The newer single chip Atheros wireless chipsets like the AR5424,

AR2423 etc. are mostly compatible to the AR5212 but use a different
algorithm to set the 2GHz RF channel, that's why they didn't work in
OpenBSD.  I figured out that the channels were set with an offset,
setting channel 11 in the driver caused the hardware to set channel 5
etc.  Because I didn't figure out the pattern to fix the algoritm yet,
I fixed it in a workaroundish way by defining a small "table" with
offsets for the 11b channels to get the right results. For example, if
we want to set channel 11 (2462MHz), we add an offset of -30MHz, and
feed the result (2432MHz ^= channel 5) into the unmodified
AR5212/AR5112 RF setup function.

Long description for a commit message, but it needed some time to
figure it out. It is still not perfect, needs some more work, and it
doesn't work in all cases; but it allows to use newer chipsets in 11b
mode restricted to 1 or to 2Mbit/s.  11a mode seems to work without
problems so far.

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