meta-intel-openbmc: Use '=' with remove

Yocto has started throwing WARNINGs about using 'remove' with '+=':

WARNING: ...:remove += is not a recommended operator combination, please replace it.

This changes the '+=' in those cases to '='.

Tested: confirmed that it builds without these warnings

Signed-off-by: Jason M. Bills <jason.m.bills@intel.com>
Change-Id: I54377229cd05bcb89f4c5edbb303dcc54e629192
diff --git a/meta-intel-openbmc/meta-common/recipes-core/systemd/obmc-targets.bbappend b/meta-intel-openbmc/meta-common/recipes-core/systemd/obmc-targets.bbappend
index 6f19a5e..edf0986 100644
--- a/meta-intel-openbmc/meta-common/recipes-core/systemd/obmc-targets.bbappend
+++ b/meta-intel-openbmc/meta-common/recipes-core/systemd/obmc-targets.bbappend
@@ -1,9 +1,9 @@
 # Remove these files since they are provided by obmc-intel-targets
-SYSTEMD_SERVICE:${PN}:remove:intel += " obmc-host-start@.target"
-SYSTEMD_SERVICE:${PN}:remove:intel += " obmc-host-stop@.target"
-SYSTEMD_SERVICE:${PN}:remove:intel += " obmc-host-reboot@.target"
-SYSTEMD_SERVICE:${PN}:remove:intel += " obmc-host-startmin@.target"
-SYSTEMD_SERVICE:${PN}:remove:intel += " obmc-chassis-poweron@.target"
-SYSTEMD_SERVICE:${PN}:remove:intel += " obmc-chassis-poweroff@.target"
-SYSTEMD_SERVICE:${PN}:remove:intel += " obmc-chassis-hard-poweroff@.target"
-SYSTEMD_SERVICE:${PN}:remove:intel += " obmc-chassis-powerreset@.target"
+SYSTEMD_SERVICE:${PN}:remove:intel = " obmc-host-start@.target"
+SYSTEMD_SERVICE:${PN}:remove:intel = " obmc-host-stop@.target"
+SYSTEMD_SERVICE:${PN}:remove:intel = " obmc-host-reboot@.target"
+SYSTEMD_SERVICE:${PN}:remove:intel = " obmc-host-startmin@.target"
+SYSTEMD_SERVICE:${PN}:remove:intel = " obmc-chassis-poweron@.target"
+SYSTEMD_SERVICE:${PN}:remove:intel = " obmc-chassis-poweroff@.target"
+SYSTEMD_SERVICE:${PN}:remove:intel = " obmc-chassis-hard-poweroff@.target"
+SYSTEMD_SERVICE:${PN}:remove:intel = " obmc-chassis-powerreset@.target"