legacy: evtest is dropped from input-tools package

We select BR2_PACKAGE_EVTEST automatically. This has only limited use:
when the LEGACY_CHECK menu is disabled in menuconfig (or even oldconfig),
it will also unselect BR2_PACKAGE_EVTEST again. Still, it can serve as a
hint of how to fix things.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>