Allow disabling mounting of /var/log

[volleynator]

Is your feature request related to a problem? Please describe.
We are using a k8s cluster which disallows the mounting of hostPaths. However, we are able to mount a volume which contains all the logs a node produces via a feature our k8s provider calls "user host logging".
I want to use extraVolumeMount for this, however, I also need to disable the mount of /var/log at all:

func (r *Reconciler) generateVolumeMounts() (v []corev1.VolumeMount) {
        # make this optional
	v = []corev1.VolumeMount{
		{
			Name:      "varlogs",
			ReadOnly:  true,
			MountPath: "/var/log/",
		},
		{
			Name:      "config",
			MountPath: OperatorConfigPath,
		},
	}

Describe the solution you'd like
I want to be able to disable the mount of "/var/log"

Describe alternatives you've considered
Do not use the fluentBitSpec but run my own Daemonset of fluentBit

[csatib02]

Hey @volleynator,

We can add something similar like this: #1959

[volleynator]

I already saw that. I am not familiar with go but it looks like I can try to implement the feature. I'll come up with a PR for that if you want?

[csatib02]

Would be awesome! :)

[csatib02]

Done in: #2043