meta-phosphor: change systemd.bbclass to match upstream override syntax

Upstream bbclasses changed to typically use the `:${PN}` override
syntax, including the SYSTEMD_ variables.  Change our systemd.bbclass
to do the same for consistency and perform a tree-wide variable
replacement.

Spot checked by building bletchley and witherspoon and checking
some of the SYSTEMD_LINK directives on installed packages under qemu.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I20a9dd809bff8af8759488734f80486c7228c6eb
diff --git a/meta-phosphor/recipes-phosphor/state/phosphor-state-manager_git.bb b/meta-phosphor/recipes-phosphor/state/phosphor-state-manager_git.bb
index 83939c4..4080966 100644
--- a/meta-phosphor/recipes-phosphor/state/phosphor-state-manager_git.bb
+++ b/meta-phosphor/recipes-phosphor/state/phosphor-state-manager_git.bb
@@ -174,12 +174,12 @@
 SYSTEMD_SERVICE:${PN}-obmc-targets += "${@compose_list(d, 'HOST_SYNCH_FMT', 'HOST_SYNCH_TARGETS')}"
 SYSTEMD_SERVICE:${PN}-obmc-targets += "${@compose_list(d, 'HOST_ACTION_FMT', 'HOST_ACTION_TARGETS')}"
 
-SYSTEMD_LINK_${PN}-obmc-targets += "${@compose_list(d, 'CHASSIS_LINK_SYNCH_FMT', 'CHASSIS_SYNCH_TARGETS', 'OBMC_CHASSIS_INSTANCES')}"
-SYSTEMD_LINK_${PN}-obmc-targets += "${@compose_list(d, 'CHASSIS_LINK_ACTION_FMT', 'CHASSIS_ACTION_TARGETS', 'OBMC_CHASSIS_INSTANCES')}"
-SYSTEMD_LINK_${PN}-obmc-targets += "${@compose_list(d, 'HOST_LINK_SYNCH_FMT', 'HOST_SYNCH_TARGETS', 'OBMC_HOST_INSTANCES')}"
-SYSTEMD_LINK_${PN}-obmc-targets += "${@compose_list(d, 'HOST_LINK_ACTION_FMT', 'HOST_ACTION_TARGETS', 'OBMC_HOST_INSTANCES')}"
-SYSTEMD_LINK_${PN}-obmc-targets += "${@compose_list(d, 'FAN_LINK_FMT', 'OBMC_CHASSIS_INSTANCES')}"
-SYSTEMD_LINK_${PN}-obmc-targets += "${@compose_list(d, 'QUIESCE_FMT', 'HOST_ERROR_TARGETS', 'OBMC_HOST_INSTANCES')}"
+SYSTEMD_LINK:${PN}-obmc-targets += "${@compose_list(d, 'CHASSIS_LINK_SYNCH_FMT', 'CHASSIS_SYNCH_TARGETS', 'OBMC_CHASSIS_INSTANCES')}"
+SYSTEMD_LINK:${PN}-obmc-targets += "${@compose_list(d, 'CHASSIS_LINK_ACTION_FMT', 'CHASSIS_ACTION_TARGETS', 'OBMC_CHASSIS_INSTANCES')}"
+SYSTEMD_LINK:${PN}-obmc-targets += "${@compose_list(d, 'HOST_LINK_SYNCH_FMT', 'HOST_SYNCH_TARGETS', 'OBMC_HOST_INSTANCES')}"
+SYSTEMD_LINK:${PN}-obmc-targets += "${@compose_list(d, 'HOST_LINK_ACTION_FMT', 'HOST_ACTION_TARGETS', 'OBMC_HOST_INSTANCES')}"
+SYSTEMD_LINK:${PN}-obmc-targets += "${@compose_list(d, 'FAN_LINK_FMT', 'OBMC_CHASSIS_INSTANCES')}"
+SYSTEMD_LINK:${PN}-obmc-targets += "${@compose_list(d, 'QUIESCE_FMT', 'HOST_ERROR_TARGETS', 'OBMC_HOST_INSTANCES')}"
 
 SRC_URI += "git://github.com/openbmc/phosphor-state-manager"
 SRCREV = "0d1c3f1f9329c853677f0581287afef83eeea0f0"