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main/postmarketos-initramfs: add support for multi-device btrfs

Administrator requested to merge btrfs-multi-device into master

This change fixes booting with a multi-device btrfs volume as root filesystem. A multi-device btrfs volume will find all partitions or devices automatically when mounted, but this only works if btrfs device scan was run beforehand.

This adds a call to btrfs device scan before mounting if the root filesystem is btrfs.

The command will only run for btrfs root filesystems, so I consider this change fairly safe.

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