mm: remove rest usage of VM_NONLINEAR and pte_file()

mm: remove rest usage of VM_NONLINEAR and pte_file()

commit 0661a33611fca12570cba48d9344ce68834ee86c upstream.

One bit in ->vm_flags is unused now!

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[bwh: Backported to 3.16: Drop changes in mm/debug.c]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>