lvm2 package provides some user-space tools, but also some dynamic
libraries: libdevmapper, libdevmapper-event, etc.
This commit allows to package the LVM2 libraries in a different package
than the LVM2 user-space tools. This way other user-space tools (e.g.
cryptsetup) that runtime depends on the LVM2 libs can only add that libs
package to the rootfs, instead of the whole LVM2 utilities.
Signed-off-by: Javier Viguera <javier.viguera@digi.com>