Non-functional cleanup, no change in behavior.
device_printf() already prefixes each line with the device name, so the
inline "atlantic:" token in the status and error messages produced a
doubled prefix and diverged from the trace macros; remove it so all
output carries one uniform "aqN:" prefix. Compile the RX/TX descriptor
tracers only when AQ_CFG_DEBUG_LVL > 2 and make them no-op macros
otherwise, so the default build no longer pays a cross-TU call plus
argument evaluation per descriptor.
Drop enum aq_dev_state, struct aq_rx_filters, and struct aq_vlan_tag,
which have no remaining references now that VLAN state lives in a
bitstr_t. Replace the four identical aq_sysctl_print_{tx,rx}_{head,tail}
handlers, each carrying a dead write path on a read-only oid, with one
aq_sysctl_print_ring_ptr that selects the accessor from arg2. Reduce the
thermal and PHY-recovery comments to single terse lines that keep the
load-bearing register numbers and the A1-vs-A2 recovery difference.
Signed-off-by: Nick Price <nick@spun.io>