staging: vt6656: hostap.c: Remove unused macros and some useless comments

The unused macros were reporteds by forgotten-macros
tool(https://github.com/marcosps/forgotten_macros

).

Signed-off-by: Marcos Paulo de Souza <marcos.souza.org@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>