BACKPORT: FROMGIT: binder: reverse locking order in shrinker callback

The locking order currently requires the alloc->mutex to be acquired
first followed by the mmap lock. However, the alloc->mutex is converted
into a spinlock in subsequent commits so the order needs to be reversed
to avoid nesting the sleeping mmap lock under the spinlock.

The shrinker's callback binder_alloc_free_page() is the only place that
needs to be reordered since other functions have been refactored and no
longer nest these locks.

Some minor cosmetic changes are also included in this patch.

Signed-off-by: Carlos Llamas <cmllamas@google.com>
Link: https://lore.kernel.org/r/20231201172212.1813387-28-cmllamas@google.com


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

Bug: 254650075
Bug: 320576997
(cherry picked from commit e50f4e6c
 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git


 char-misc-next)
Change-Id: I7f7501945a477ac5571082a5dd2a7934f484b8ab
[cmllamas: fixed conflicts due to missing e66b77e5]
Signed-off-by: Carlos Llamas <cmllamas@google.com>