Remove --freeze-reshape logic

Remove --freeze-reshape logic

This commit removes --freeze-reshape logic, it basicaly reverts
commit b76b30e0f950 ("Do not continue reshape during initrd phase").
--freeze-reshape was supposed to be used to restore critical sector in
incremental and assemble operations without starting a reshape process,
but it's meaning has been lost through the years and it is not
currently used.

A replacement for this logic will be added in incoming patches, so
reshapes won't be started in initrd phrase.

Signed-off-by: Mateusz Kusiak <mateusz.kusiak@intel.com>