swappiness: add tuneable parameter for swappiness when using/not using zRAM in kconfig entry
ashmem: Fix ashmem_shrink deadlock.

Don't acquire ashmem_mutex in ashmem_shrink if we've somehow recursed into the
shrinker code from within ashmem. Just bail out, avoiding a deadlock. This is
fine, as ashmem cache pruning is advisory anyhow.

Signed-off-by: Robert Love <rlove@google.com>
config: drop zRAM for testing