When using RHSM Service (deployment/rhsm/rhsm-baremetal-ansible.yaml) based
registration of the overcloud nodes and enabling the KSM using
NovaComputeEnableKsm=True the overcloud deployment will fail because the
RHSM registration and the ksm task run as host_prep task. The handling
of enable/disable ksm is now handled in deploy step 1.
Closes-Bug: #1904184
Change-Id: I75a59f3d4b640f3146f2a865eff8be3f1383e078