[media] m5mols: Change auto exposure control default value to AUTO

Enabling automatic exposure yields better image quality. With this setting
the anti-flicker algorithm is also enabled in automatic frequency detection
mode which effectively eliminates distortion from fluctuations of light
intensity at power line frequency.

Acked-by: HeungJun Kim <riverful.kim@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>