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.