Resolution of timer acquisition code dispute

[Technical Review Board]

After considering the arguments from interested parties, the TRB voted
unanimously to revert the removal of the timer acqusition code as well
as the pca(4) driver.  The TRB has noted that the API is not ideal but
does not think that it can be removed without any deprecation period
while it is in active use.  The TRB does think that it would be a good
idea to mark the code with BURN_BRIDGES and deprecate it for 6.0.  This
should give the consumers of this API ample time to implement a more
suitable alternative. 

--

John Baldwin (speaking for the TRB)