[media] media: drx39xyj driver change to check fe exit flag from release

Change drx39xyj_release() to check fe exit flag to detect the
device disconnect state and avoid accessing the device after
it has been removed.

Signed-off-by: Shuah Khan <shuah.kh@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>