improve NTP package conflict handling (#12212)

Signed-off-by: bo.jiang <bo.jiang@daocloud.io>

roles/kubernetes/preinstall/defaults/main.yml

@@ -55,17 +55,6 @@ minimal_node_memory_mb: 1024
 minimal_master_memory_mb: 1500
 
 ## NTP Settings
-# Start the ntpd or chrony service and enable it at system boot.
-ntp_enabled: false
-# The package to install which provides NTP functionality.
-# The default is ntp for most platforms, or chrony on RHEL/CentOS 7 and later.
-# The ntp_package can be one of ['ntp', 'ntpsec', 'chrony']
-ntp_package: >-
-      {% if ansible_os_family == "RedHat" -%}
-      chrony
-      {%- else -%}
-      ntp
-      {%- endif -%}
 
 # Manage the NTP configuration file.
 ntp_manage_config: false