meta-romulus: Remove P9 host watchdog workaround

Remove the watchdog workaround patch from meta-romulus;
And remove the patch itself since no machine is using it anymore.

Change-Id: I2a1d8cbce3637562a35f738fce8c6bea2738528c
Signed-off-by: Lei YU <mine260309@gmail.com>
diff --git a/meta-romulus/recipes-phosphor/chassis/obmc-control-chassis.bbappend b/meta-romulus/recipes-phosphor/chassis/obmc-control-chassis.bbappend
index b60282f..5e8ab25 100644
--- a/meta-romulus/recipes-phosphor/chassis/obmc-control-chassis.bbappend
+++ b/meta-romulus/recipes-phosphor/chassis/obmc-control-chassis.bbappend
@@ -1,3 +1 @@
-SRC_URI += "file://skeleton-0001-Temporarily-disable-watchdog-support.patch \
-            file://skeleton-0001-Quick-fix-to-ensure-we-run-mbx-workaround-on-reboots.patch"
-
+SRC_URI += "file://skeleton-0001-Quick-fix-to-ensure-we-run-mbx-workaround-on-reboots.patch"