[display] Use only array based datapipe binding
[display] Use only array based datapipe binding

Since datapipe_bindings_init() can now be used for installing input
filter callbacks too, there is no need to use lower level callback
append/remove functionality anymore.

Signed-off-by: Simo Piiroinen <6d5e5360bed3d486f7d9fb26b0f737f7d4fd45ee@jollamobile.com>

spiiroin/mce,spiiroin/mce,spiiroin/mce,spiiroin/mce