meta-bletchley: reduce burst times of motor-init-calibration

We notice the motor-init-calibration service spend more than 20 seconds
for one run, which doesn't match the stop conditions with current
service setting(more than 5 runs in 90 sec).

Becaused motor-init-calibration services keep restart, it caused BMC
CPU remain high utilization and trigger reboot action by
phosphor-health-monitor.

Reduce StartLimitBurst to 2 to ensure the service stops after attempt 2
failed.

Tested results:
root@bletchley:~# journalctl -u motor-init-calibration@6.service | grep systemd
Nov 16 22:18:00 bletchley systemd[1]: Starting Motor Initialize for sled6...
Nov 16 22:18:25 bletchley systemd[1]: motor-init-calibration@6.service: Main process exited, code=exited, status=1/FAILURE
Nov 16 22:18:26 bletchley systemd[1]: motor-init-calibration@6.service: Failed with result 'exit-code'.
Nov 16 22:18:26 bletchley systemd[1]: Failed to start Motor Initialize for sled6.
Nov 16 22:18:27 bletchley systemd[1]: motor-init-calibration@6.service: Scheduled restart job, restart counter is at 1.
Nov 16 22:18:27 bletchley systemd[1]: Stopped Motor Initialize for sled6.
Nov 16 22:18:27 bletchley systemd[1]: Starting Motor Initialize for sled6...
Nov 16 22:18:46 bletchley systemd[1]: motor-init-calibration@6.service: Main process exited, code=exited, status=1/FAILURE
Nov 16 22:18:46 bletchley systemd[1]: motor-init-calibration@6.service: Failed with result 'exit-code'.
Nov 16 22:18:46 bletchley systemd[1]: Failed to start Motor Initialize for sled6.
Nov 16 22:18:47 bletchley systemd[1]: motor-init-calibration@6.service: Scheduled restart job, restart counter is at 2.
Nov 16 22:18:47 bletchley systemd[1]: Stopped Motor Initialize for sled6.
Nov 16 22:18:47 bletchley systemd[1]: motor-init-calibration@6.service: Start request repeated too quickly.
Nov 16 22:18:47 bletchley systemd[1]: motor-init-calibration@6.service: Failed with result 'exit-code'.
Nov 16 22:18:47 bletchley systemd[1]: Failed to start Motor Initialize for sled6.

Signed-off-by: Potin Lai <potin.lai@quantatw.com>
Change-Id: I45c423deceb3cedd9157a479e0f33f9dbf270b8f
diff --git a/meta-facebook/meta-bletchley/recipes-bletchley/motor-ctrl/files/motor-init-calibration@.service b/meta-facebook/meta-bletchley/recipes-bletchley/motor-ctrl/files/motor-init-calibration@.service
index e77c782..da9cbec 100644
--- a/meta-facebook/meta-bletchley/recipes-bletchley/motor-ctrl/files/motor-init-calibration@.service
+++ b/meta-facebook/meta-bletchley/recipes-bletchley/motor-ctrl/files/motor-init-calibration@.service
@@ -1,7 +1,7 @@
 [Unit]
 Description=Motor Initialize for sled%i
 StartLimitIntervalSec=90
-StartLimitBurst=5
+StartLimitBurst=2
 Requires=phosphor-gpio-presence@presence-sled%i.service
 After=phosphor-gpio-presence@presence-sled%i.service
 Wants=mapper-wait@-xyz-openbmc_project-inventory-system-chassis-presence-presence_sled%i.service