Add Support for V6 instance types for Azure autoscaler e.g Standard_E16s_v6

[eyltl]

Which component are you using?:
Cluster-autoscaler

Which autoscaling component hosted in this repository (cluster-autoscaler, vertical-pod-autoscaler, addon-resizer, helm charts) is the bug in?
cluster-autoscaler,

Add one of the following areas:

/area cluster-autoscaler

Currently cluster-autoscaler in the latest version does not support v6 instances type e.g Standard_E16s_v6