Add option to ignore vdev_id match to peer hash lookup API
when vdev_id is passed as 0xff to the API, it ignores vdev_id
argument
This option is needed for usecases like peer level statistics
display where only MAC address is known and vdev_id is not known
Also add the missing accounting of rx broadcast frames in the
overall statistics
Change-Id: I9939ac8bf30f6be3d216f9aa28d52560bf445e06