radio-iris: Fix bug in the AF_LIST event handling

- Bug in the AF_LIST event handling, there copying af_list bytes,
  but it should be (af_list * 4).

Change-Id: I13b2535347e1030945d78d506c656279f311fb90
CRs-Fixed: 476076
Signed-off-by: Venkateshwarlu Domakonda <Venkateshwarlu@codeaurora.org>