buildroot

ola: remove package

ola does not build with current protobuf. Upstream bug report is still open.

https://github.com/OpenLightingProject/ola/issues/1192

Cc: Dave Skok <blanco.ether@gmail.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>