[media] drx-j: Fix detection of no signal
[media] drx-j: Fix detection of no signal

When the signal is 7, it means that no signal was received.

Value experimentally measured.

Signed-off-by: Mauro Carvalho Chehab <0cae1d1e981e84d16b82ca3d17be8a7f826608d3@samsung.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs