FROMGIT: mm: for !CONFIG_PER_VMA_LOCK equate write lock assertion for vma and mmap

When CONFIG_PER_VMA_LOCK=n, vma_assert_write_locked() should be equivalent
to mmap_assert_write_locked().

Link: https://lkml.kernel.org/r/20230804152724.3090321-3-surenb@google.com


Suggested-by: Jann Horn <jannh@google.com>
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Linus Torvalds <torvalds@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

(cherry picked from commit f0cdd55d6dd8c7a1b333049e4f83eb25fef312ad
https: //git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable)

Bug: 293665307
Change-Id: Ie20ff6c35fb2f561f2061c5d0135238b7b03afa5
Signed-off-by: Suren Baghdasaryan <surenb@google.com>