meta-ibm: use systemd_system_unitdir

This variable was added to bitbake.conf so lets use it.  Using it is
best pratice and enables things like alternative base_libdir paths.

Change-Id: I9adcec7856c6242d86f0ffad8646a23219ccca21
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-ibm/recipes-phosphor/console/obmc-console_%.bbappend b/meta-ibm/recipes-phosphor/console/obmc-console_%.bbappend
index a35e6d4..f493ef5 100644
--- a/meta-ibm/recipes-phosphor/console/obmc-console_%.bbappend
+++ b/meta-ibm/recipes-phosphor/console/obmc-console_%.bbappend
@@ -37,7 +37,7 @@
                 "
 SYSTEMD_SERVICE_${PN}_remove_p10bmc = "obmc-console-ssh.socket"
 
-FILES_${PN}_remove_p10bmc = "/lib/systemd/system/obmc-console-ssh@.service.d/use-socket.conf"
+FILES_${PN}_remove_p10bmc = "${systemd_system_unitdir}/obmc-console-ssh@.service.d/use-socket.conf"
 
 EXTRA_OECONF_append_p10bmc = " --enable-concurrent-servers"
 
@@ -55,7 +55,7 @@
                 "
 SYSTEMD_SERVICE_${PN}_remove_witherspoon-tacoma = "obmc-console-ssh.socket"
 
-FILES_${PN}_remove_witherspoon-tacoma = "/lib/systemd/system/obmc-console-ssh@.service.d/use-socket.conf"
+FILES_${PN}_remove_witherspoon-tacoma = "${systemd_system_unitdir}/obmc-console-ssh@.service.d/use-socket.conf"
 
 EXTRA_OECONF_append_witherspoon-tacoma = " --enable-concurrent-servers"