meta-facebook: minerva: remove CPU_CRIT_TGT in health monitor config

Our SIT team reported an issue that SSH will disconnect by the remote host when doing the stress by the script (while 1 to reading firmware version) on multiple terminals. After we reproduced on our side, we found that CPU usage will be over 90 % during stress and then cause BMC to reboot by health monitor. We remove reboot.target in CPU_CRIT_TGT from CPU critical threshold to avoid this issue.

Change-Id: Ifd0ca2b13b3ae1474503cf646b7b2c8c52af6ca9
Signed-off-by: Yang Chen <yang.chen@quantatw.com>
diff --git a/meta-facebook/meta-minerva/recipes-phosphor/health/phosphor-health-monitor_%.bbappend b/meta-facebook/meta-minerva/recipes-phosphor/health/phosphor-health-monitor_%.bbappend
new file mode 100644
index 0000000..6a04728
--- /dev/null
+++ b/meta-facebook/meta-minerva/recipes-phosphor/health/phosphor-health-monitor_%.bbappend
@@ -0,0 +1 @@
+CPU_CRIT_TGT = ""