package/efl/libefl: add jp2k config option

Like for webp format, add an option to enable the JPEG 2000
codec support in the efl libraries.

Signed-off-by: Romain Naour <romain.naour@openwide.fr>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>