This fixes an issue like that:
* the system disk is say 10GiB
* STATE is fixed 100 MiB always
* EPHEMERAL is configured to be min 6 GiB, max 100 GiB
As the EPHEMERAL/STATE provisioning order was not defined, EPHEMERAL
might be created first, occupying whole disk and leaving no space left
for STATE.
Signed-off-by: Andrey Smirnov <andrey.smirnov@siderolabs.com>