Revert "BACKPORT: FROMGIT: mm/cma.c: make kmemleak aware of all CMA regions"

This reverts commit e5149291. This
solution was ultimately not merged upstream. Revert this commit so that
the proper solution that was merged upstream [1] can be applied to this
branch.

[1]: https://lore.kernel.org/all/20230208232001.2052777-1-isaacmanjarres@google.com/


Bug: 265065728
Change-Id: I1a614f4a8268d0fb3caf5645fc61539afba7305d
Signed-off-by: Isaac J. Manjarres <isaacmanjarres@google.com>