meta-ampere: mtmitchell: state: enable no-warm-reboot

It is expected to do power cycle on Mt.Mitchell with IPMI and Redfish
Host reset command.
As commit 41983bfe2 removes no-warm-reboot to be enabled by default,
need to enable in meta-ampere/meta-mitchell to support this behavior.

Tested:
1. Run ipmitool chassis power reset
--> expect to have the Host power off and then on

Change-Id: Ie61d7d5de170b0a26bd736c9b4e8789c566a93c9
Signed-off-by: Thang Q. Nguyen <thang@os.amperecomputing.com>
diff --git a/meta-ampere/meta-mitchell/recipes-phosphor/state/phosphor-state-manager_%.bbappend b/meta-ampere/meta-mitchell/recipes-phosphor/state/phosphor-state-manager_%.bbappend
new file mode 100644
index 0000000..b0d6f09
--- /dev/null
+++ b/meta-ampere/meta-mitchell/recipes-phosphor/state/phosphor-state-manager_%.bbappend
@@ -0,0 +1 @@
+PACKAGECONFIG:append = " no-warm-reboot"