Disable readonly partitions in mtdparts.

Barebox marks its own mtd partitions as read-only, which
makes it impossible for ginstall to write to them.

To update barebox to not mark its partitions readonly
requires us to write to the readonly partitions...

Change-Id: Ib1da38a79198b38e76c9e4aa74d1530175c1d483
1 file changed