meta-quanta: gbs: install obmc-mapper.target

Some services need obmc-mapper.target to start in correct
order, such as phosphor-virtual-sensors.

ref:
https://gerrit.openbmc-project.xyz/43952
https://gerrit.openbmc-project.xyz/43535

Signed-off-by: George Hung <george.hung@quantatw.com>
Change-Id: Ia463c9f189d715336626ce9e46cad0a370e9b8dd
diff --git a/meta-quanta/meta-gbs/recipes-phosphor/images/obmc-phosphor-image.bbappend b/meta-quanta/meta-gbs/recipes-phosphor/images/obmc-phosphor-image.bbappend
index 494f9f4..9860495 100644
--- a/meta-quanta/meta-gbs/recipes-phosphor/images/obmc-phosphor-image.bbappend
+++ b/meta-quanta/meta-gbs/recipes-phosphor/images/obmc-phosphor-image.bbappend
@@ -43,3 +43,5 @@
 OBMC_IMAGE_EXTRA_INSTALL:append:gbs = " phosphor-pid-control"
 # Required for phosphor-ipmi-kcs
 OBMC_IMAGE_EXTRA_INSTALL:append:gbs = " virtual-obmc-host-ipmi-hw"
+# Required for some services, such as phosphor-virtual-sensors
+OBMC_IMAGE_EXTRA_INSTALL:append:gbs = " obmc-targets"