In some cases functionality from mce-plugin-libhybris that works and
is needed in some devices can cause problems in other devices - for
example using android hwc2 interface for display blank/unblank purposes
can interfere with minui based unlock/upgrade UIs on devices that use
kms/drm instead of legacy frame buffer.

Make it possible to use configuration files for enabling / disabling
features implemented in the hybris plugin.

Keep all features enabled by default.

Install configuration file that keeps enabled those features that actually
might be used by mce and disables the rest.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>