kernel-balena: remove global blacklist of btrfs
kernel-balena: remove global blacklist of btrfs

The kernel-balena class contains a global blacklist of btrfs that
disables this filesystem for all device types, regardless of them
explicitly enabling it.

Remove this config to allow devices to enable this filesystem.

Change-type: patch
Signed-off-by: Joseph Kogut <461476587780aa9fa5611ea6dc3912c146a91760@balena.io>
resin-os/meta-resin,resin-os/meta-resin,resin-os/meta-resin,resin-os/meta-resin