radio-iris: Fix in the AF_LIST event handling

- Copying more than available size in AF list buffer which leads to crash.
- Added a check to avoid copy more than available size.

Change-Id: I8f00c6dd82e64ee2744bfad63ea4523b206732a6
CRs-Fixed: 498758
Signed-off-by: Venkateshwarlu Domakonda <Venkateshwarlu@codeaurora.org>
Merge "radio-iris: Fix in the AF_LIST event handling"