8832: Depricating vlanconf and start using netifd

Description: Broadcom has better support of linux standard way of configuring VLAN instead of vlanconf. Validated deployment scenarios vlanconf vs netifd VLAN handling and captured details on ticket.

Ticket link: https://project.iopsys.eu/issues/8832

Fix Summary: Removing vlanconf based VLAN handling and netifd will be used for VLAN handling.

vlanconf removal MR link: targets!523 (closed)