libjpeg-turbo: Add RPROVIDES to fix errors when rdepending on jpeg

This fixes "ERROR: Multiple .bb files are due to be built which each provide jpeg"

Signed-off-by: Samuel Stirtzel <s.stirtzel@googlemail.com>
Acked-by: Chase Maupin <chase.maupin@ti.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>