Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC r267066 and r267041:
Fixes for the RSU driver:
- The R92S_TCR register is an 8-bit register. Don't access it like a
16-bit register.
- Disable parsing the delete station event, due to many false events.
- Ensure that there is only one transfer queue for each endpoint, so
to hal packets transmitted don't get out of order.
- Properly align temporary buffer to 32-bit.
- Add an extra parenthesis to make expression clear.
- Range check the association ID received from hardware.

MFC r266466, r266471, r266484, r266505, r266535 and r266542:
Fix multiple issues in the RSU driver.

MFC r260463:

Replace deprecated M_DONTWAIT with M_NOWAIT.

MFC r260444:

Rename definition of IEEE80211_FC1_WEP to IEEE80211_FC1_PROTECTED.

The origin of WEP comes from IEEE Std 802.11-1997 where it defines
whether the frame body of MAC frame has been encrypted using WEP
algorithm or not.
IEEE Std. 802.11-2007 changes WEP to Protected Frame, indicates
whether the frame is protected by a cryptographic encapsulation
algorithm.

Reviewed by: adrian, rpaulo

MFC r238274, r246752, r256720, r256721, r256722, r256955, r257409
r257429, r257435, r257712, r257732, r257743, r257748, r257955
r257957, r257958, r258082, r258641, r258643, r258732, r258733,
r258840, r258919, r258921, r259029, r259030, r259031, r259032 and r259046:

- Add support for the MediaTek/Ralink RT5370/RT5372 chipset.
- Various minor USB WLAN fixes and improvements.

PR: usb/182936

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Cleanup the allocations when the attachment fails.

Unbreak sparc64 LINT. Need to fix this correctly at some point in the future.

Import OpenBSD's rsu(4) WLAN driver.
Support chipsets are the Realtek RTL8188SU, RTL8191SU, and RTL8192SU.

Many thanks to Idwer Vollering for porting/writing the man page and for
testing.

Reviewed by: adrian, hselasky
Obtained from: OpenBSD
Tested by: kevlo, Idwer Vollering <vidwer at gmail.com>