IRIX: Pull NFS translator hooks

IRIX: Pull NFS translator hooks

We've never had working NFS translator for IRIX, and the system call
codes which are required to install the symbols used by the IBM
translator have long been used for other things by OpenAFS.

Simplify this mess by just removing the translator stubs from the kernel
module, and all of the code in afsd which used to handle pulling
addresses out of the kernel module so that we can hook ourselves in.

Change-Id: I2da2b0040afc0191e236706126d75bc7d39c0936
Reviewed-on: http://gerrit.openafs.org/5375
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>