staging: rtl8187se: Convert ChnlAccessSetting typedef into a struct.

The Documentation/CodingStyle doesn't recommend the use of typedef, convert
this to structure.

While at it, I have also renamed the variable names that were used in
this typedef not to use Hungarian notation.

Signed-off-by: Ana Rey <anarey@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>