spec: split out lvm2 support into sub-package

The LVM2 support bits, especially the host service, depend on lvm2
tooling. Since not every user of osbuild may want to build images
with LVM2 split that out into its own sub-package and have that it
depend on LVM2.

osbuild.spec

@@ -68,6 +68,15 @@ Summary:        %{summary}
 %description -n python3-%{pypi_name}
 A build system for OS images
 
+%package        lvm2
+Summary:        LVM2 support
+Requires:       %{name} = %{version}-%{release}
+Requires:       lvm2
+
+%description lvm2
+Contains the necessary stages and device host
+services to build LVM2 based images.
+
 %package        ostree
 Summary:        OSTree support
 Requires:       %{name} = %{version}-%{release}
@@ -167,6 +176,9 @@ exit 0
 %{_mandir}/man5/%{name}-manifest.5*
 %{_datadir}/osbuild/schemas
 %{pkgdir}
+# the following files are in the lvm2 sub-package
+%exclude %{pkgdir}/devices/org.osbuild.lvm2*
+%exclude %{pkgdir}/stages/org.osbuild.lvm2*
 # the following files are in the ostree sub-package
 %exclude %{pkgdir}/assemblers/org.osbuild.ostree*
 %exclude %{pkgdir}/inputs/org.osbuild.ostree*
@@ -180,6 +192,10 @@ exit 0
 %{python3_sitelib}/%{pypi_name}-*.egg-info/
 %{python3_sitelib}/%{pypi_name}/
 
+%files lvm2
+%{pkgdir}/devices/org.osbuild.lvm2*
+%{pkgdir}/stages/org.osbuild.lvm2*
+
 %files ostree
 %{pkgdir}/assemblers/org.osbuild.ostree*
 %{pkgdir}/inputs/org.osbuild.ostree*