net/ieee802154: Fix net mgmt request to get core settings
net/ieee802154: Fix net mgmt request to get core settings

Obviously s/SET/GET

Change-Id: Iab4fa82ee6c53cb53806bf131655605a21125c3b
Signed-off-by: Tomasz Bursztyka <ba81a3a719836727e6857ae83462b9f52ec41006@linux.intel.com>

fbsder/zephyr,fbsder/zephyr,fbsder/zephyr,fbsder/zephyr,fbsder/zephyr