Kill old, non-INTRNG code on ARM

[Ian Lepore]

On Sat, 2018-08-11 at 08:52 -0600, Warner Losh wrote:
> One last thing, even though we're in a slush, is to kill the pre-
> INTRNG
> code.
> 
> It's required for armv6 and v7 for some time (only the Amlogic 8726
> boards
> remain broken there). And we're down to two families of chips which
> support
> armv5: rt1310 and the Marvel gear. Both of them support INTRNG.
> 
> I propose we eliminate the INTRNG option and unifdef the code to
> remove the
> undefined case.
> 
> Comments?
> 

Wait a sec, the INTRNG option can't go away, it's used by multiple
arches these days. What we can do is make it on-by-default for arm*
arches, and eliminate any #if[n]def INTRNG in arm-specific code.

-- Ian