[media] iguanair: cannot send data from the stack

Note that the firmware already disables the receiver before transmit,
there is no need to do this from the driver.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>