BACKPORT: FROMGIT: Revert "binder_alloc: add missing mmap_lock calls when using the VMA"

This reverts commit 44e602b4.

This caused a performance regression particularly when pages are getting
reclaimed. We don't need to acquire the mmap_lock to determine when the
binder buffer has been fully initialized. A subsequent patch will bring
back the lockless approach for this.

[cmllamas: resolved trivial conflicts with renaming of alloc->mm]

Fixes: 44e602b4 ("binder_alloc: add missing mmap_lock calls when using the VMA")
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Carlos Llamas <cmllamas@google.com>
Link: https://lore.kernel.org/r/20230502201220.1756319-1-cmllamas@google.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Bug: 284244471
Bug: 284081259
Bug: 274561072
(cherry picked from commit 02ec549bdac3e58dcee65fb0526487b22fb757b6
 git: //git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
 char-misc-linus)
[cmllamas: original revert applies cleanly]
Change-Id: I9bc61b9ff1f9fa7931e2b2b87dde01aa89906e9f
Signed-off-by: Carlos Llamas <cmllamas@google.com>