dcd_lpc17_40: fix stale EP0 out_received, add isochronous support

EP0 control-OUT fix (usbtest 14/21, errno 110/-74): usbd queues the
status-stage OUT ZLP of every control read with buffer=NULL, so the ISR's
`if (out_buffer)` check missed it and marked the arriving ZLP as
out_received instead. The stale flag poisoned the next control-OUT with
data: its first chunk "completed" instantly from an empty EP0 buffer and
the host's real DATA NAKed forever. Track queued transfers with an
explicit out_queued flag and void half-finished control state on a new
SETUP.

Isochronous support (UM10562 12.15.6): 5-word DMA descriptors with
per-packet size memory, buflen/present_count in packets, one packet per
FRAME (no DMARSet/EpIntEn involvement), completion at EOT for both
directions. Details that matter:
- the iso machinery (5th DD word + packet-size memory) is compiled only
  when an iso-capable class is enabled (CFG_TUD_AUDIO/VIDEO/VENDOR), so
  non-iso builds pay nothing: _dcd stays 648 B vs 1032 B with iso
- ISR dispatch keys on the hardware's fixed ep-number/type map
  (ep_id_is_iso), never on dd fields that thread mode rebuilds
- iso OUT honors Packet_valid (bit 16) and prefills the hardware
  writeback slots with 0, so a missed frame counts as 0 bytes instead of
  reading back stale buffer contents as data
- packet count is validated (tu_div_ceil <= ISO_MAX_PACKETS) before the
  DD is touched, so an oversized transfer is refused without leaving a
  serviceable half-built descriptor armed for the frame engine
- dcd_edpt_iso_alloc and iso_activate both enforce the fixed iso endpoint
  numbers (3/6/9/12); classes ignore alloc's return value, so activate
  must not trust it

Un-skip LPC40XX in the usbtest example; tier 4 now enumerates and passes
iso cases 15/16/22/23. cdc_msc_throughput and printer_to_cdc had bulk on
iso-only EP3 (SET_CONFIGURATION failed with -32); add the LPC17/40 EPNUM
block (bulk on EP2/EP5) like other fixed-EP examples.

Verified on ea4088_quickstart: usbtest tier-4 battery 30/30 repeatedly
and the full device HIL suite 14/14 (incl. audio_test iso).

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