LINUX 5.6: use struct proc_ops for proc_create

LINUX 5.6: use struct proc_ops for proc_create

The Linux commit d56c0d45f0e27f814e87a1676b6bdccccbc252e9
(proc: decouple proc from VFS with "struct proc_ops") was merged into
Linux 5.6rc1.  The commit replaces the 'file_operations' parameter for
proc_create with a new structure 'proc_ops'.

Conditionally initialize and use proc_ops structures instead of
file_operations structures for calls to proc_create.

Notes:
 * proc_ops.proc_ioctl is equivalent to file_operations.unlocked_ioctl
 * The macros HAVE_UNLOCKED_IOCTL and HAVE_COMPAT_IOCTL are both
   hardcoded to 1 in linux's fs.h
 * proc_ops.compat_ioctl is conditional on Linux's CONFIG_COMPAT macro
   which is a separate test from the HAVE_COMPAT_IOCTL macro

Reviewed-on: https://gerrit.openafs.org/14063
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Mark Vitale <mvitale@sinenomine.net>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
(cherry picked from commit 1626986bd6d70c526376cf7cedfd3ebbf6d3588a)

Change-Id: Icaab45f4542131e636f2c60e3efce86c8afc57be
Reviewed-on: https://gerrit.openafs.org/14069
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Yadavendra Yadav <yadayada@in.ibm.com>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>