btrfsmaintenance: install to ${datadir}/${BPN}

* fix installed-vs-shipped with multilib:

ERROR: QA Issue: lib32-btrfsmaintenance: Files/directories were installed but not shipped in any package:
  /usr
  /usr/share
  /usr/share/lib32-btrfsmaintenance
  /usr/share/lib32-btrfsmaintenance/btrfsmaintenance-functions
  /usr/share/lib32-btrfsmaintenance/btrfs-defrag.sh
  /usr/share/lib32-btrfsmaintenance/prepare-release.sh
  /usr/share/lib32-btrfsmaintenance/btrfs-trim.sh
  /usr/share/lib32-btrfsmaintenance/btrfsmaintenance-refresh-cron.sh
  /usr/share/lib32-btrfsmaintenance/btrfs-scrub.sh
  /usr/share/lib32-btrfsmaintenance/btrfs-balance.sh
  /usr/share/lib32-btrfsmaintenance/dist-install.sh
  /usr/share/lib32-btrfsmaintenance/btrfs-defrag-plugin.sh
  /usr/share/lib32-btrfsmaintenance/update-balance-usage-defaults.sh
Please set FILES such that these items are packaged. Alternatively if they are unneeded, avoid installing them or delete them within do_install.
lib32-btrfsmaintenance: 13 installed and not shipped files. [installed-vs-shipped]

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-filesystems/recipes-utils/btrfsmaintenance/btrfsmaintenance_0.5.bb

@@ -38,9 +38,9 @@ do_install() {
         ${D}${systemd_system_unitdir}
 
     install -Dm0644 ${S}/btrfsmaintenance-functions \
-        ${D}${datadir}/${PN}/btrfsmaintenance-functions
+        ${D}${datadir}/${BPN}/btrfsmaintenance-functions
     install -Dm0755 ${S}/*.sh \
-        ${D}${datadir}/${PN}
+        ${D}${datadir}/${BPN}
 
     install -Dm0644 ${S}/sysconfig.btrfsmaintenance \
         ${D}${sysconfdir}/default/btrfsmaintenance