distro: explain why we ignore ntp customization

When setting the customizations for the kickstart file, we ignore the
ntp server part of the timezone settings.  While kickstart does support
setting these, our kickstart stage does not.  Add a comment for future
reference.

pkg/distro/fedora/images.go

@@ -531,6 +531,8 @@ func iotInstallerImage(workload workload.Workload,
 	img.Groups = users.GroupsFromBP(customizations.GetGroups())
 
 	img.Language, img.Keyboard = customizations.GetPrimaryLocale()
+	// ignore ntp servers - we don't currently support setting these in the
+	// kickstart though kickstart does support setting them
 	img.Timezone, _ = customizations.GetTimezoneSettings()
 
 	img.AdditionalAnacondaModules = []string{

pkg/distro/rhel8/images.go

@@ -443,6 +443,8 @@ func edgeInstallerImage(workload workload.Workload,
 	img.Groups = users.GroupsFromBP(customizations.GetGroups())
 
 	img.Language, img.Keyboard = customizations.GetPrimaryLocale()
+	// ignore ntp servers - we don't currently support setting these in the
+	// kickstart though kickstart does support setting them
 	img.Timezone, _ = customizations.GetTimezoneSettings()
 
 	if instCust := customizations.GetInstaller(); instCust != nil {

pkg/distro/rhel9/images.go

@@ -391,6 +391,8 @@ func edgeInstallerImage(workload workload.Workload,
 	img.Groups = users.GroupsFromBP(customizations.GetGroups())
 
 	img.Language, img.Keyboard = customizations.GetPrimaryLocale()
+	// ignore ntp servers - we don't currently support setting these in the
+	// kickstart though kickstart does support setting them
 	img.Timezone, _ = customizations.GetTimezoneSettings()
 
 	if instCust := customizations.GetInstaller(); instCust != nil {