device-solidrun-cubox: switch partitition_type to msdos
Since pmbootstrap!2426 (merged), pmbootstrap defaults to a gpt
partition type,
the legacy u-boot on the cubox does not support gpt
.
Therefore the deviceinfo was adjusted to return to msdos
type partition
table.
Tested sucessfully on actual HW with new install
Signed-off-by: Robert Eckelmann longnoserob@postmarketos.org