BR2_DEPRECATED: update option label and help

We should use positive logic (show things that are otherwise hidden...)
for the help since it's what it does.
It also applies to more options than just packages alone, for example
the AVR32 architecture so add an "options" label to it.

[Peter: tweak help text as suggested by Yann]
Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>