Linux: replace invalidate_inode_pages

Linux: replace invalidate_inode_pages

This helper has been deprecated for a while, and gets removed
with 2.6.34.
Replace it with invalidate_remote_inode, which has been around for
all of 2.6's life, according to Chaskiel in RT #124377.

Change-Id: I8658b454e1c997c041f654ba55d06f713ea25459
Reviewed-on: http://gerrit.openafs.org/1523
Reviewed-by: Simon Wilkinson <sxw@inf.ed.ac.uk>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 80481fb14ea9301b0f6b3503d07ecaef39aef0d8)
Signed-off-by: Anders Kaseorg <andersk@mit.edu>
Reviewed-on: http://gerrit.openafs.org/1988