hmi: Increase system size

aum-offline-upgrade-signed test fails due to minimum free space not available:

+ ostree commit -b apertis/v2022pre/amd64-uefi/hmi --tree=ref=3e202159469e012e96de20b3c11abbc703ae7e1cd04dcd62e57ea78567553d40 --timestamp=1 year ago --skip-list=/tmp/skip
error: Writing content object: min-free-space-percent '3%' would be exceeded, at least 499.7 kB requested

Disk usage during lava test:

df -h; echo overlay-3.1.4.tar.gz
Filesystem               Size         Used    Available  Use% Mounted on       
tmpfs                   5.0Mi            0        5.0Mi    0% /run/lock       
tmpfs                 937.6Mi            0      937.6Mi    0% /dev/shm        
tmpfs                 937.6Mi            0      937.6Mi    0% /tmp            
tmpfs                 100.0Mi            0      100.0Mi    0% /media          
/dev/mmcblk1p1        240.3Mi       45.8Mi      194.5Mi   19% /boot/efi       
tmpfs                 187.5Mi        8.0Ki      187.5Mi    0% /run/user/1000  
udev                  915.5Mi            0      915.5Mi    0% /dev            
/dev/mmcblk1p3          9.1Gi      286.1Mi        8.8Gi    3% /home           
/dev/mmcblk1p2          4.3Gi        3.7Gi      575.9Mi   87% /               
tmpfs                 187.5Mi      728.0Ki      186.8Mi    0% /run

Also increase HMI debos's scratchsize as ostree-commit for arm64 fails during flatpak local repository extraction due to no space left on device error.

Signed-off-by: Frédéric Danis frederic.danis@collabora.com