net: lwm2m: mark OPTIONAL resources for IPSO Temperature
net: lwm2m: mark OPTIONAL resources for IPSO Temperature

Using IPSO Smart Object Guideline: "Smart Objects Starter Pack 1.0"
dated May 27, 2017, let's mark the OPTIONAL resources for an
IPSO Temperature object (Section 10. "IPSO Object: Temperature").

Signed-off-by: Michael Scott <17b9e1c64588c7fa6419b4d29dc1f4426279ba01@opensourcefoundries.com>

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