net: lwm2m: optimize variable order in lwm2m_perform_read_op()
net: lwm2m: optimize variable order in lwm2m_perform_read_op()

Let's sort by largest to smallest so that we don't leave odd gaps
in memory.

Signed-off-by: Michael Scott <a17fed27eaa842282862ff7c1b9c8395a26ac320@foundries.io>

galak/zephyr,kraj/zephyr,explora26/zephyr,kraj/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,ldts/zephyr,kraj/zephyr,punitvara/zephyr,galak/zephyr,ldts/zephyr,explora26/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,nashif/zephyr,finikorg/zephyr,galak/zephyr,punitvara/zephyr,GiulianoFranchetto/zephyr,kraj/zephyr,Vudentz/zephyr,finikorg/zephyr,punitvara/zephyr,zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,GiulianoFranchetto/zephyr,explora26/zephyr,kraj/zephyr,galak/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,explora26/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,nashif/zephyr,galak/zephyr,ldts/zephyr,finikorg/zephyr,Vudentz/zephyr,punitvara/zephyr,ldts/zephyr,explora26/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,nashif/zephyr,punitvara/zephyr,finikorg/zephyr,Vudentz/zephyr