Introduce new host-startmin action target

Requirements have arisen for OpenBMC firmware to run
certain services only during fresh power on operations.
To achieve that, break the obmc-host-start action target into
two targets. The existing obmc-host-start target will now
call the new obmc-host-startmin target. The startmin target
will be the minimum services required to start the host.
The obmc-host-start target is where services that should
only be called during a fresh power on can be placed.

The initial use case for this is the obmc-host-reboot target.
It will call this new obmc-host-startmin target to do the bare
minimum on a reboot operation.

This then allows the use case for OpenBMC to only reset the host
reboot count on a fresh power on operation. A new service will
be added to the obmc-host-start target to do this. If a reboot
operation is issued, or a host watchdog is triggered to cause a
reboot, this service would not be started, ensuring the reboot
count is properly decremented.

Tested: Verified on/off/reboot and ran CT regression suite.
https://gerrit.openbmc-project.xyz/#/c/9821/ is required
for reboots to work properly.

Change-Id: I86df03e6d671178c1525f852e196c4102bb73cb6
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/common/recipes-core/systemd/obmc-targets/obmc-host-reboot@.target b/common/recipes-core/systemd/obmc-targets/obmc-host-reboot@.target
index 5ee53ae..dc280ea 100644
--- a/common/recipes-core/systemd/obmc-targets/obmc-host-reboot@.target
+++ b/common/recipes-core/systemd/obmc-targets/obmc-host-reboot@.target
@@ -4,7 +4,7 @@
 After={SYSTEMD_DEFAULT_TARGET}
 Wants=mapper-wait@-org-openbmc-control-chassis%i.service
 After=mapper-wait@-org-openbmc-control-chassis%i.service
-Conflicts=obmc-host-start@%i.target
+Conflicts=obmc-host-startmin@%i.target
 RefuseManualStop=yes
 OnFailure=obmc-chassis-poweroff@%i.target
 OnFailureJobMode=flush