net: l2: ieee802154: add short address to ll address
net: l2: ieee802154: add short address to ll address

This is a preparatory change that fixes one aspect of short address
handling before fixing endianness so that the endianness fix can be
applied consistently in this method.

Signed-off-by: Florian Grandel <246eb2863b4e4387bb88d1fd54b2484fd4fc7b20@gmail.com>

finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,galak/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr