staging/rtl8192e: Remove unused code

Remove unused #defines, structure, and inlined functions for the
rtl8192e driver.  Compile tested only.

Signed-off-by: Jon Mason <jdmason@kudzu.us>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>