Bluetooth: Shell: Add back erroneously removed ll-addr command

Add back erroneously removed ll-addr command, when removing
legacy Controller, which is provided when using Zephyr
Bluetooth Low Energy Controller to read the random and
public address set by the Host, and used by the Controller.

Relates to commit b67a31e4 ("Bluetooth: controller:
Remove legacy LL").

Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>