I also have this noise not the brake pads or caliper?
Took the front drivers side wheel off,disc,caliper got a tin of spray silicone grease and sprayed some into
where the wheel bearing is.
Put everything back and took it for a drive the nosie stopped!
Thing is after the grease has worn away (after some time ) the noise comes back
So i have put noise down to a dry wheel bearing which is very expensive at lexus to have done!
I hope this helps?