staging: atomisp: fix missing break in switch statement

I believe there is a missing break in the switch statement for
case V4L2_CID_FOCUS_STATUS as the current fall-through looks
suspect to me.

Detected by CoverityScan, CID#1416580 ("Missing break in switch")

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>