Open ppc64le_linux sysname space

Open ppc64le_linux sysname space

While here, add config/param.ppc64le_linux26.h; it's just like
ppc64_linux26.h, except not AFSBIG_ENDIAN.

Reviewed-on: https://gerrit.openafs.org/13562
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
Reviewed-by: Jeffrey Altman <jaltman@auristor.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
(cherry picked from commit 191e18ebcee3698a76b55912de0a41111c384128)

Change-Id: I9852da2a376a24269ff720a4da4881dae83036cd
Reviewed-on: https://gerrit.openafs.org/13589
Reviewed-by: Cheyenne Wills <cwills@sinenomine.net>
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
Reviewed-by: Mark Vitale <mvitale@sinenomine.net>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>