systemd: delete files that end up in /var/volatile

${localstatedir}/log/journal is created by tmpfiles.d on boot, and the README
just causes warnings that /var/volatile isn't empty when mounting on top of it.

(From OE-Core rev: dfcd8f2a6f5847d735755c1644c4c93be4fbb3e8)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/systemd/systemd_208.bb

@@ -97,9 +97,6 @@ do_install() {
 	ln -s ${rootlibexecdir}/systemd/systemd ${D}/init
 	ln -s ${rootlibexecdir}/systemd/systemd-udevd ${D}/${base_sbindir}/udevd
 
-	# Create dir for journal
-	install -d ${D}${localstatedir}/log/journal
-
 	# Create machine-id
 	# 20:12 < mezcalero> koen: you have three options: a) run systemd-machine-id-setup at install time, b) have / read-only and an empty file there (for stateless) and c) boot with / writable
 	touch ${D}${sysconfdir}/machine-id
@@ -113,6 +110,9 @@ do_install() {
 		install -m 0755 ${WORKDIR}/init ${D}${sysconfdir}/init.d/systemd-udevd
 		sed -i s%@UDEVD@%${rootlibexecdir}/systemd/systemd-udevd% ${D}${sysconfdir}/init.d/systemd-udevd
 	fi
+
+        # Delete journal README, as log can be symlinked inside volatile.
+        rm -f ${D}/${localstatedir}/log/README
 }
 
 do_install_ptest () {