systemd: provides ${base_sbindir}/udevadm

In some udev rules files such as 97-hid2hci.rules from bluez5, it calls
/sbin/udevadm in a rule. eudev provides /usr/bin/udevadm and
/sbin/udevadm which is a link to /usr/bin/udevadm. But systemd only
provides /bin/udevadm. It is not convenient to update the rule file that
udevadm reside in different directories for eudev and system.

So create link file ${base_sbindir}/udevadm in systemd just the same as
eudev to fix such kind of issues.

(From OE-Core rev: c8bf23349af4972a76cb4b13179dac844812d75f)

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

meta/recipes-core/systemd/systemd_242.bb

@@ -287,6 +287,9 @@ do_install() {
 		fi
 	fi
 
+	# create link for existing udev rules
+	ln -s ${base_bindir}/udevadm ${D}${base_sbindir}/udevadm
+
 	# duplicate udevadm for postinst script
 	install -d ${D}${libexecdir}
 	ln ${D}${base_bindir}/udevadm ${D}${libexecdir}/${MLPREFIX}udevadm
@@ -604,6 +607,7 @@ FILES_udev += "${base_sbindir}/udevd \
                ${systemd_unitdir}/system/*udev* \
                ${systemd_unitdir}/system/*.wants/*udev* \
                ${base_bindir}/udevadm \
+               ${base_sbindir}/udevadm \
                ${libexecdir}/${MLPREFIX}udevadm \
                ${datadir}/bash-completion/completions/udevadm \
               "