camera: Wait for continous focus to complete before taking a picture

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Change-Id: I2aef0e3e413c9a8708fe1c87860beb287c844a1c
Merge pull request #9 from T-Macgnolia/jb-mr2

camera: Wait for continous focus to complete before taking a picture