menuconfig: Small Space/Enter improvement + fix for obscure bug

Update menuconfig (and Kconfiglib, just to sync) to upstream revision
7e0b9f7ae1, to get these commits in:

  menuconfig: Improve space/enter behavior slightly

  Space toggles value is possible, and enters menus otherwise. Enter
  works the other way around.

  Make this explicit in the code, which also fixes some corner cases,
  like space doing nothing on a y-selected menuconfig symbol.

  -------------------------------------------------------------------

  menuconfig: Fix display issue for unsatisfied-deps selected symbol
  with children

  A symbol with unsatisfied direct dependencies can end up with visible
  children in an implicit submenu if it is selected (though that
  generates a warning), so the optimization in _shown_nodes() isn't
  safe, and causes the child nodes to not be shown outside show-all
  mode.

  Just remove the optimization. Trying things out some more,
  everything's plenty fast enough anyway.

  Checking the direct dependencies of the parent instead would be safe.

The menu path now says "(Top)" instead of "(top menu)" too, which is a
bit more compact. Make the same change in genrest.py.

Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>