net/ice/base: refactor post DDP download VLAN mode config

net/ice/base: refactor post DDP download VLAN mode config

Currently it's not clear that only the first PF downloads the package
and configures the VLAN mode. When this is happening all other PFs are
blocked on the global configuration lock. Once the package is
successfully downloaded and the global configuration lock has been
released then all PFs resume initialization. This includes some post
package download VLAN mode configuration. To make this more obvious add
the new function ice_post_pkg_dwnld_vlan_mode_cfg() so any/all post
download VLAN mode configuration code can be put in here.

This also makes it more clear that all PFs will call this new function.

Signed-off-by: Brett Creeley <brett.creeley@intel.com>
Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
Acked-by: Qiming Yang <qiming.yang@intel.com>