net: lwm2m: use correct remote address when DTLS is enabled
net: lwm2m: use correct remote address when DTLS is enabled

The default net_context remote address is scrambled when using a
connection via DTLS.  Instead let's use the dtls context remote.

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

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