v850: generic timekeeping conversion

v850: generic timekeeping conversion

Convert an arch that does not currently implement sub-jiffy timekeeping to
use the generic timekeeping code.

v850 looks like it has some intent to implement sub-jiffy timekeeping, so
it may not yet be appropriate to try to convert, but I figured I'd get the
maintainer's input and submit the patch for comment.

Signed-off-by: John Stultz <[email protected]>
Cc: Miles Bader <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>