systemd: change dependency relationships

When building out a systemd based image, the udev-hwdb postinstall
script always fails at rootfs time. This is because that the 'udevadm'
command used in udev-hwdb postinstall script is now in the udev
package and udev recommends udev-hwdb.

Instead of letting udev recommends udev-hwdb, we let systemd do it
and make udev-hwdb rdepend on udev.

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

recipes-tweaks/systemd/systemd_215.bb

@@ -250,7 +250,7 @@ FILES_${PN}-dev += "${base_libdir}/security/*.la ${datadir}/dbus-1/interfaces/ $
 
 RDEPENDS_${PN} += "kmod dbus util-linux-mount udev (= ${EXTENDPKGV})"
 
-RRECOMMENDS_${PN} += "systemd-serialgetty systemd-compat-units \
+RRECOMMENDS_${PN} += "systemd-serialgetty systemd-compat-units udev-hwdb\
                       util-linux-agetty \
                       util-linux-fsck e2fsprogs-e2fsck \
                       kernel-module-autofs4 kernel-module-unix kernel-module-ipv6 \
@@ -261,7 +261,8 @@ PACKAGES =+ "udev-dbg udev udev-hwdb"
 FILES_udev-dbg += "/lib/udev/.debug"
 
 RPROVIDES_udev = "hotplug"
-RRECOMMENDS_udev += "udev-hwdb"
+
+RDEPENDS_udev-hwdb += "udev"
 
 FILES_udev += "${base_sbindir}/udevd \
                ${rootlibexecdir}/systemd/systemd-udevd \