[media] s5p-jpeg: fix g_selection op

V4L2_SEL_TGT_COMPOSE_DEFAULT switch case should select whole
available area of the image and V4L2_SEL_TGT_COMPOSE
should apply user settings.

Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>