Pull up the following, requested by msaitoh in ticket #1938:

sys/dev/pci/if_wm.c 1.792,1.794-1.798 via patch
sys/dev/pci/if_wmreg.h 1.131

- Add RQDPC(Receive Queue Drop Packet Count) to iqdrops.
- Drop frames if the RX descriptor ring has no room on multiqueue system.
- Improve dmesg output.
  - Print RX packet buffer size.
  - Fix the upper 16bit of Image Unique ID(EtrackID).
- Fix comment.

(martin)