Revert to basing all timeout/timer values in ms rather than us. The switch

Revert to basing all timeout/timer values in ms rather than us.  The switch
to us was to help out the Linux port, but really just invited overflow.
In fact, the request sense timer was overflowing prior to this change making
it much shorter than intended.

aic_osm_lib.h:
        Be more careful about overflow in all timer/timeout primitives.

Obtained-from: FreeBSD