Previously commit openwrt/packages@3abb7cb ("lvm2: Added script and updated Makefile[...]")
couldn't actually work and allow rootfs_data to be stored on a LVM2 as
the necessary kernel modules had not been loaded at this point.
Fix this by loading device-mapper modules early at boot.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
(cherry picked from commit 82f9ad6ab21ca4925278429a3e1b31d26c306d9f)
2dafc04b4d