fs_mgr: Skip zram setup on swapon_all if mmd zram management is enabled

mmd will be launched as a new zram management system which deprecates
the old zram management using swapon_all. The new mmd and swapon_all are
mutually exclusive.

On devices which enables both mmd_enabled AConfig flag and
"mmd.zram.enabled" system property, swapon_all command should skip
setting up zram and let mmd set up zram.

After mmd is launched swapon_all will show deprecation warning logs for
zram setup.

Bug: 393481329
Bug: 396063022
Test: manual

Change-Id: I0ca5db51a82a829157e92d2b58259add3d9bb3d5