Get improvements from FreeBSD-current (January 2011).
Successfully tested with WEP, WPA and WPA2 on AR9285.
Reviewed by jmcneill@

Fix prototypes to match the functions. The prototypes had `int' specified for
parameters or result where they should have been the corresponding enums.

gcc won't bitch on them but conceptually they

Fix prototypes to match the functions. The prototypes had `int' specified for
parameters or result where they should have been the corresponding enums.

gcc won't bitch on them but conceptually they are different and could be
stored in a different width. Compiling with pcc brought this to light.

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Import Atheros HAL, from FreeBSD (revision 185521)