ivi-layout: abort without controller_module_init

When loading a controller module, if we do not find a
controller_module_init symbol, return failure to the caller instead of
ignoring the failure.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Tested-by: Nobuhiko Tanibata <NOBUHIKO_TANIBATA@xddp.denso.co.jp>