net: lwm2m: add missing resources to Firmware Update object
net: lwm2m: add missing resources to Firmware Update object

Firmware Update object did not initialise resources PkgName,
PkgVersion and Firmware Update Protocol Support. Initialise
Firmware Update Protocol Support on creation and report CoAP
as default transfer protocol.

Signed-off-by: Marin Jurjević <b0cd402275f93db923f965efd471b503030e79b6@hotmail.com>

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