net/axgbe: support VLAN

net/axgbe: support VLAN

Added VLAN support for AMD XGBE driver

Adding below APIs for axgbe
- axgbe_enable_rx_vlan_stripping: to enable vlan header stripping
- axgbe_disable_rx_vlan_stripping: to disable vlan header stripping
- axgbe_enable_rx_vlan_filtering: to enable vlan filter mode
- axgbe_disable_rx_vlan_filtering: to disable vlan filter mode
- axgbe_update_vlan_hash_table: crc calculation and hash table update
  based on vlan values post filter enable
- axgbe_vlan_filter_set: setting of active vlan out of max 4K values
  before doing hash update of same
- axgbe_vlan_tpid_set: setting of default tpid values
- axgbe_vlan_offload_set: a top layer function to call strip/filter etc
  based on mask values

Signed-off-by: Girish Nandibasappa <girish.nandibasappa@amd.com>
Acked-by: Somalapuram Amaranath <asomalap@amd.com>