net: lwm2m: increase IPSO light object color size
net: lwm2m: increase IPSO light object color size

Add some extra space to the color resource buffer, to allow more
exotic and application-specific color spaces.

Signed-off-by: Marti Bolivar <fd5da480b758a78208111e6ae5c6806e1f887137@foundries.io>

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