mac80211: add a bunch of rt2x00 specific changes

Backport some rt2x00 specific changes from
wireless-testing/master-2013-08-26 to add
support for RT3573 based devices.

Also refresh the rt2x00 specific patches.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37843 3c298f89-4303-0410-b956-a3cf2f4a3e73
ar71xx: don't register USB device on WNDAP360

Apparently registering usb device on newest trunk causes
this AP not to boot...
Since there is no USB socket in that device anyway this
can be simply removed (and device boots then no problem).

[juhosg:
  - tweak subject line and description,
  - remove #include "dev-usb.h",
  - remove 'select ATH79_DEV_USB' from Kconfig]

Signed-off-by: Jacek Kikiewicz <jaceq@aol.pl>
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37844 3c298f89-4303-0410-b956-a3cf2f4a3e73
ar71xx: don't hardwire cpu_has_dsp{,2} to zero

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37845 3c298f89-4303-0410-b956-a3cf2f4a3e73