[config] Enable CONFIG_CHECKPOINT_RESTORE. Fixes: JB#22021

Enable CONFIG_CHECKPOINT_RESTORE to have lock-ls-mem working.

Signed-off-by: Philippe De Swert <philippe.deswert@jollamobile.com>
Merge pull request #6 from philippedeswert/config-checkpoint

[config] Enable CONFIG_CHECKPOINT_RESTORE. Fixes: JB#22021