atomisp: return framerate for VIDIOC_G_PARM ioctl call

atomisp: return framerate for VIDIOC_G_PARM ioctl call

BZ: 41720

VIDIOC_G_PARM should return the video frame rate, so call the
sensor driver to get the frame rate and return it.

Change-Id: Icbe636971934facfa11bf4732e0d4230c23e2789
Signed-off-by: Tuukka Toivonen <tuukka.toivonen@intel.com>
Reviewed-on: http://android.intel.com:8080/53070
Reviewed-by: Wang, Wen W <wen.w.wang@intel.com>
Reviewed-by: Koski, Anttu <anttu.koski@intel.com>
Tested-by: Koski, Anttu <anttu.koski@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>