StartPreview only after setting fps range paramters

Starting the preview before setting fps range causes
first supported fps range to be set while preview is
running in a different(default) fps range. This can
cause teh fps range for the first supported fps range
to be inaccurately measured.

Signed-off-by: Akwasi Boateng <akwasi.boateng@ti.com>

Change-Id: Ica6011f04dde0a5c7d801f94595916b004464d24