MFC of r306388, r306510, r306511 and r306513:

Fix a typo.

Sort and remove unnecessary includes.

Fix a typo in CPSW_DEBUG MACRO and then replace all the CPSWP_DEBUG() calls
with CPSW_DEBUG().

Remove the GLOBAL queue lock which just adds unnecessary complexity to code
(when used together with the individual tx and rx locks).

Sponsored by: Rubicon Communications, LLC (Netgate)