efl: do not force dependency on libudev by making eeze a config option.

efl: do not force dependency on libudev by making eeze a config option.

Although highly recommended to be enabled, EFL's eeze can be disabled
and thus no dependency on libudev or dynamic device management.

Since 'BR2_PACKAGE_HAS_UDEV' has two ways to be satisfied (eudev or
systemd) we can't automatically select it, instead show a comment and
use 'depends on'.

Signed-off-by: Gustavo Sverzut Barbieri <barbieri@profusion.mobi>
[Romain:
  - Propagate the eeze dependency to enlightenment and efl Wayland
  - Remove udev provider from eeze comment in efl's Config.in
  - Add comments when eeze is not available]
Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>