meta-romulus: Increase delay in host reboot

By default phosphor-reboot-host@.service sleeps for 5 seconds between
power off and power on.
On Romulus, this interval is not enough for CPU to clear the error
status, e.g. checkstop status.
Increase the interval to 8 seconds to makre sure the status is cleared.

Resolves openbmc/openbmc#3330

Tested: Verify the checkstop status is cleared after error injection.

Change-Id: I14ab9975fe820e7fba27feaf1da32a2903d4bc13
Signed-off-by: Lei YU <mine260309@gmail.com>
diff --git a/meta-openbmc-machines/meta-openpower/meta-ibm/meta-romulus/recipes-phosphor/state/phosphor-state-manager.bbappend b/meta-openbmc-machines/meta-openpower/meta-ibm/meta-romulus/recipes-phosphor/state/phosphor-state-manager.bbappend
new file mode 100644
index 0000000..4db6f3a
--- /dev/null
+++ b/meta-openbmc-machines/meta-openpower/meta-ibm/meta-romulus/recipes-phosphor/state/phosphor-state-manager.bbappend
@@ -0,0 +1 @@
+FILESEXTRAPATHS_prepend_romulus := "${THISDIR}/${PN}:"
diff --git a/meta-openbmc-machines/meta-openpower/meta-ibm/meta-romulus/recipes-phosphor/state/phosphor-state-manager/obmc/phosphor-reboot-host/reboot.conf b/meta-openbmc-machines/meta-openpower/meta-ibm/meta-romulus/recipes-phosphor/state/phosphor-state-manager/obmc/phosphor-reboot-host/reboot.conf
new file mode 100644
index 0000000..ad50cf6
--- /dev/null
+++ b/meta-openbmc-machines/meta-openpower/meta-ibm/meta-romulus/recipes-phosphor/state/phosphor-state-manager/obmc/phosphor-reboot-host/reboot.conf
@@ -0,0 +1,3 @@
+# Sleep 8 seconds on Romulus to make sure the checkstop status on
+# CPU is cleared. See https://github.com/openbmc/openbmc/issues/3330
+REBOOT_DELAY=8